【初中英语】 一般现在时专项练习和答案(1)
【初中英语】一般现在时专项练习(附答案)
6．She wants to be a famous singer when she ___________.
A. grown up B. growing up C. grew up D. grows up
【答案】D
【解析】【分析】句意：当她长大时，她想当一名著名的歌手。分析句子结构可知，此处是when引导的时间状语从句，when从句应该用一般现在时代替将来时，且此处主语是第三人称单数，所以谓语动词用三单形式，故选D。
【答案】B
【解析】【分析】句意：只要凯文少吃肉多吃蔬菜，他就会比以前更健康。as long as引导的条件状语从句，时态是主将从现，主语是he第三人称单数，故谓语动词是单三式，故选B。
【点评】考查状语从句，注意主谓一致的用法。
8．—Jill is the best singer in my class.
【答案】B
【解析】【分析】句意：我不知道他明天是否回来。如果他来，我会马上打电话给你。第一个空，根据tomorrow，可知宾语从句是时态是一般将来时，第二个空是if引导的条件状语从句，时态是主将从现，故此处是一般现在时，故选B。
【点评】考查宾语从句，注意一般将来时的用法。
3．From the science book, Tom learned that the moon ______around the earth.
【点评】考查一般现在时，注意根据时间状语确定句子的时态。
10．— ________ you like hamburgers?
— No, I ________.
A. Are; am not B. Do; am not C. Are; don't D. Do; don't
人教版中考英语中考英语总复习一般现在时专项练习(附答案)
人教版中考英语中考英语总复习一般现在时专项练习(附答案)一、初中英语一般现在时1．Sam's uncle is a good cook. He very well.A. cookB. cookingC. cooksD. cooked【答案】 C【解析】【分析】句意：山姆的叔叔是一名优秀的厨师。
他厨技精湛。
此题考查一般现在时的用法。
主语为he，动词用单三式。
答案为C。
2．—Let's go fishing if it ____ this weekend.—But nobody knows if it ____.A. is fine; will rainB. will be rain; rainsC. will be fine; will rainD. is fine; rains 【答案】 A【解析】【分析】句意：——如果本周末天晴，我们一起去钓鱼吧。
——但是没人知道是否下雨。
第一空if引导条件状语从句，条件状语从句遵循主将从现的原则，从句用一般现在时表将来时，故排除BC，第二空前knows后引导宾语从句，描述将来发生的事情，用一般将来时，其结构为will+动词原形，故选A。
【点评】考查动词的时态和形式。
注意一般现在时和一般将来时的用法。
3．—Mr. Li, may I ask you more questions here tomorrow?—Well, I'm not sure if I______ here tomorrow. But you can leave massages on my WeChat if you ______ any questions at any time.A. come; haveB. will come; will haveC. will come; haveD. come; will have【答案】 C【解析】【分析】句意：——李老师，明天我可以在这里多问你些问题吗？——嗯，我不确定明天我是否在这里。
九年级英语 一般现在时专项练习和答案
九年级英语一般现在时专项练习和答案一、初中英语一般现在时1．— Let's _______ basketball.— That _______ good.A. playing; isB. play; soundsC. play; is soundD. to play; sounds【答案】 B【解析】【分析】句意：——我们一起打篮球吧。
——那听起来很好。
let's后接动词原形，排除选项A和D；sound是系动词，后跟形容词作表语，其主语That表单数含义。
故选B。
【点评】考查祈使句及系动词。
2．She _____ out alone at night.A. dare not to goB. dares not goC. doesn't dare to goD. doesn't dares go【答案】 C【解析】【分析】句意：晚上她不敢一个人出去。
dare可以作情态动词也可以作行为动词，作情态动词时，后面直接跟动词原形，没有人称与数的变化，构成否定时直接在dare 后加not，作行为动词时后跟动词不定式，构成否定需要助动词，故答案是C。
【点评】考查dare的用法，注意dare做情态动词和行为动词的用法上的区别。
3．Our Geography teacher told us that the Earth ____________ the sun.A. went aroundB. goes aroundC. is going aroundD. was going around【答案】 B【解析】【分析】句意：我们的地理老师告诉我们地球绕着太阳转。
地球绕着太阳转是客观事实，故用一般现在时，故选B。
【点评】考查宾语从句时态，注意一般现在时的用法。
4．—I don't know if it tomorrow.—Well, if it , the school sports meeting will be cancelled.A. will rain；will rainB. rains；will rainC. will rain；rains【答案】 C【解析】【分析】句意：——我不知道明天会不会下雨。
初中英语-时态专项练习一(一般过去时,一般现在时)
1.将下列句子改成否定句，一般疑问句并回答： 1. I speak English. I don’t speak English.
Do you speak English? Yes, I do/ No ,I don’t.
2.We like maths. We don’t like maths.
Do you like maths? Yes, we do/ No , we don’t.
3.They go swimming on Sundays.
They don’t go swimming on Sundays. Do they go swimming on Sundays? Yes ,they do/No , they don’t.
4.He gets up very early.
Ex1. 写出下列词的单三形式：
look; go; give; fly; have
looks;
goes;
gives;
flies;
has
gets get ) up at six in the morning EX2 1.Tom often_______( goes go) around the sun . 2. The earth _______( lives 3.Mary’s parent _______(live ) in Beijing .
What do the elephants like eating?
4. He sends two emails every week.
How many emails does he send every week? How often does he send two emails?
中考一般现在时练习题及答案.doc
中考一般现在时练习题及答案中考英语一般现在时专项练习题及答案9.She is always a good student.—第一部分按照要求改写句子1.Li Ming watches TV every evening.2.I do my homework every day.3.She likes milk. _______________________________4.Amy' s mother likes playing computer games.We go to school every morning.. He speaksEnglish very well. _____________________________对划线部分提问）10.Simon and Daniel like going skating. 11. Do you often play football after school?12.I have many books. _____________________________13.Gao Shan' s sister likes playing table tennis14. She lives in a small town near New York.__________________ 15. I watch TV every day.16. David has got a goal.17We have four.lessons. 18. Nancy doesn' t run fast.119. My dog runs fast. 否定句：_________________ ~■般疑问句：________________ 0. Mike has two letters for him. 一般疑问句： _________ ______ 否定句：__________ 否定句：一般疑问句：_____________ 划线提问__—否定句：一般疑问句：________________ 划线提问： _____________23. Mingming否定句：一般疑问句：划线提问否定句：一般疑问句：划线提问_____________最佳答案1.Li Ming doesn' t watch TV every evening.2.Do you do your homework every day? No, I don' t.3.Does she like milk? Yes,she does.4.Does Amy' mother like playing computer games?No,she doesn' t.5.We don' t go to school every morning.6.He doesn' t speak English very well.7.What do you like doing in the park?. John comes from Canada. Where does John come from?9.Is she always a good student? No, she isn' t.210.Simon and Daniel don' t like going skating.11.Yes, I do.12.I don' t have many books.13.Gao Shan' s sister doesn' t like playingtable tennis. 14. Does she live in a small town near New York? 15. Do you watch TV every day? 16. Has David got a goal? 17. We don' t have four lessons. 18. Nancy runs fast.19. My dog doesn' t run fast. Does your dog runfast?0. Does Mike have two letters for him? Mike doesn' t have two letters for him.21. I don' t usually play football on Friday afternoon. Do you usually play football on Friday afternoon? What do you usually do on Friday afternoon?22. Sun Yang doesn' t usually wash any clothes on Saturday. Does Sun Yang usually wash any clothes on Saturday?What does Sun Yang usually do on Saturday?3. Mingming doesn' t usually water the flowers every day. Does Mingming usually water the flowers every day? What does Mingming usually do every day?4. Tom doesn' t do his homework at home. Does Tom do his homework at home? What does Tom do at home?专项练习：一、单选1 Jenny in an office. Her parents in a hospital. A work works B works work C work are working D is working work One of the boys a black hat. A have B there is C there are D has We will go shopping if it tomorrow.A don' t rain Bdidn' t rain Cdoesn' t rain Disn' t rain He said the sun in the east and inthe west. A rose: set B rises: sets C rises, set D rise: sets Wang Mei music and often to music.A like: listenB likes: listensC like: are listeningD liking ; listen3Jenny English every evening. A has study B studies C study D studied 答案：1 BDCBBB 二、填空1 I can take Li Ming there when he comes to visit. Does your sister know English?Her home is away from her school.4The pot doesn' t look like yours very much. Where do you have lunch every day? Who wants to go swimming?Does she do the housework every day?Jenny and Danny usually play games in the afternoon . 答案： 1 comes Does know is away from doesn' t look do havewants does do play 二、单三人称形式易出错例：1 He plaies football very well. Danny gos to school at: 10, 答案：1 plays goes解析：1以辅音字母加y结尾的动词变单三人称形式才能把y换成i再加es； 2与名词变复数不同，变单三人称形式以。
人教版中考英语专项训练 (外研版)一般现在时专项练习题及答案
人教版中考英语专项训练 (外研版)一般现在时专项练习题及答案一、初中英语一般现在时1．You ________________ study hard if you want to get good grades.A. are supposeB. are supposedC. are supposed toD. suppose【答案】 C【解析】【分析】句意：如果你想取得好成绩，你应该努力学习。
根据be supposed to do sth.，应该做某事，固定搭配。
主语是you，be要用are，故选C。
【点评】考查固定搭配be supposed to do sth。
注意后接不定式形式。
2．The children will climb the mountain if it________ tomorrow.A. won't rainB. didn't rainC. isn't rainingD. doesn't rain【答案】 D【解析】【分析】句意：如果明天不下雨，孩子们会去爬山。
if 引导的条件状语从句遵循主将从现的原则，主句用一般将来时，从句用一般现在时，从句是一个否定句，含有实义动词rain的否定句，要借助助动词don't/doesn't构成，主语是it，助动词用doesn't，故选D。
【点评】考查if引导的条件状语的时态。
注意句子涉及到if引导的条件状语从句的用法。
3．Not only Li Ming but also his parents ______ in Canada now.A. isB. areC. wasD. were【答案】 B【解析】【分析】句意：现在不仅李明，而且他的父母也在加拿大。
根据now，可知时态是一般现在时，主语是his parents，复数，故用be动词用are，故选B。
【点评】考查动词辨析，注意be动词are的用法。
初中英语一般现在时专项练习
初中英语一般现在时专项练习一般现在时是英语中最基本的时态之一，它用来表达经常性的或普遍性的动作、状态或习惯。
在句子中，一般现在时的动词通常不加任何时态标志。
本文将为大家提供一系列的练习来巩固和提高初中英语一般现在时的应用技巧。
请你把这些句子翻译成英文，并注意动词的时态和主谓一致。
1. 我们每天早上6点起床。
2. 我的爸爸喜欢看电视。
3. 她通常在周末帮助家人打扫房间。
4. 我们每个星期五上英语课。
5. 她的朋友们经常一起出去散步。
6. 他们的狗每天晚上散步。
7. 她的妈妈每周三去购物。
8. 我们从不吃快餐。
9. 我喜欢和朋友们一起打篮球。
10. 他们每晚都锻炼身体。
11. 她的弟弟每天读两个小时的书。
12. 妈妈每个周末给我做巧克力蛋糕。
13. 我们每年去旅行一次。
14. 每个暑假，我都参加夏令营。
15. 他的爸爸每天开车送他去学校。
参考答案：1. We get up at 6 o'clock every morning.2. My father likes to watch TV.3. She usually helps her family clean the room on weekends.4. We have English class every Friday.5. Her friends often go for a walk together.6. Their dog takes a walk every night.7. Her mother goes shopping every Wednesday.8. We never eat fast food.9. I like playing basketball with my friends.10. They exercise every night.11. Her brother reads books for two hours every day.12. Mom makes chocolate cake for me every weekend.13. We go on a trip once a year.14. Every summer vacation, I attend summer camp.15. His father drives him to school every day.这些句子都是在描述现实或经常发生的事情，因此需要使用一般现在时来表达。
七年级英语一般现在时练习及答案
七年级英语：一般现在时专题第一部分:1-50 专项练习第二部分:51-100全面解析1．Lily usually ________ after school. Look! She ________ on the playground now.A．is running; is runningB．runs; is runningC．runs; runs2．Daniel often me with my Maths. He is a boy.A．helps, help B．helpful, helpfulC．help, helps D．helps, helpful3．At first I _______ afraid, but now I ________ afraid at all.A．feel a little, am not B．felt little, am notC．felt a little, wasn't D．felt a little, am not4．My dear mom usually makes breakfast for me, and it ______.A．tastes good B．tastes well C．is taste good D．is taste well 5．A kite _______in the sky a moment ago. But it ______there now.A．flies, isn't B．flew, isn't C．flew, was D．flied, wasn't 6．Look! There ________ lots of sheep and pigs on the hill.A．was B．were C．is D．are7．I ________ a university student one year ago. Now I ________ a teacher.A．were; were B．was; was C．was; is D．was; am 8．—What are you doing now?—I ________ soccer. I ________ soccer every Sunday.A．play; am playing B．play; playC．am playing; am playing D．am playing; play9．—______ she _______ her mother ________eating snacks?—Of course.A．Is, like, like B．Does, like, likesC．Does, like, like D．Is, like, likes10．When _______ he ________ his homework.A．does ,does B．does ,do C．do ,does D．do ,do 11．—What time _____ Rick _____ his homework?—At six thirty.A．do; do B．do; does C．does; does D．does ;do 12．There _______ any classes tomorrow if there ______ too much snow.A．isn't going to be; is going to beB．isn't going to have; isC．aren't going to be; isD．aren't going to be; is going to be13．The girl ________ black hair and she ________ of medium height.A．has; has B．is; has C．has; is D．is; is 14．Mike will give you a call if he __________ some new information.A．will get B．is getting C．gets D．got 15．The twins usually have milk and bread for breakfast, but Jim often________ some coffee for it.A．have B．has C．had D．is having 16．— Where ______ you come from?— I ______ from China.A．are, am B．do, am C．are, do D．do, do 17．Mike is a good boy. He _____late for school.A．not be B．isn't C．isn't be D．aren't 18．He______ very busy this week, but he ______ free next week.A．will be, is B．is, isC．will be, will be D．is, will be19．—Mum, I watched TV for only forty minutes. Sometimes TV is good for us.—Forty minutes enough. Now you must do your homework.A．watch；is B．watching；is C．watched；are 20．He _____ very busy this week, but he ______ free next week.A．will be; is B．is; isC．will be; will be D．is; will be21．Look! There a lot of money in the box.A．is B．are C．was D．were22．He often his homework at home.A．lose B．loses C．leave D．leaves 23．Wow! Everything half price. That is too great.A．am B．is C．are D．be 24．The United States in North America.A．lay B．lie C．lies25．—_______you play the piano?— Yes, I can.A．Need B．Can C．Could D．May 26．Jack ______sing. He is dumb. (哑的)A．couldn't B．mustn't C．can't D．needn't 27．My mom often cakes and she a strawberry cake for me yesterday.A．make; made B．makes; made C．made; make 28．My uncle ________ of medium height and ________ short black hair.A．has; is B．has; has C．is; has29．— If Alice ________ the skating club, I will buy her a pair of skating shoes.—Wow. You are a good uncle. You are very good _______ children.A．joins; with B．joined; with C．joins; at D．joined; at 30．—How do you usually go to school?—I ________ to school on foot.A．go B．went C．was going D．will go 31．Although Bill isn't rich enough, he often _______ money to the poor.A．will give B．is giving C．gives D．gave 32．If it ______tomorrow, we can go to the farm.A．will not rain B．didn't rain C．isn't raining D．doesn't rain 33．He likes to sleep with the windows ____________ in summer.A．open B．opened C．opening D．opens 34．What club _________ you want to join?A．are B．does C．can D．do 35．We ________ for a picnic if it __________rain this Sunday.A．will go, doesn't B．will go, won't go C．go, doesn't36．Everything in the house new.I like to live here.A．is B．are C．were D．/37．My grandmother usually _____ up first in our family.A．get B．getting C．gets D．got38．He often helps me ________ my homework.A．to doing B．doing C．does D．do39．Our knowledge of computers ________growing all the time.A．be B．is C．are D．were40．I often _______.She is very kind.A．miss Mr. Liu B．miss Miss LiuC．am missing Miss Liu D．am missing Mr. Liu41．One of my friends__________in America. I miss her so much.A．live B．lives C．living D．to live 42．Usually we to say goodbye in China．A．will wave B．wave C．waved D．are waving 43．If our government ______ attention to controlling food safety now, our health ______ in danger.A．won't pay; is B．doesn't pay; wasC．won't pay; will be D．doesn't pay; will be44．— What do you think of the news?—The news ________ terrible. But we are ________ in it.A．sound, interested B．sounds, interestingC．sounds, interested D．is sounding, interested45．Bob usually to school early，but this morning he to school late.A．gets；got B．gets；gets C．got；gets D．got；got 46．One of them from Africa.A．come B．coming C．are D．is 47．What time ______ Tom _________ breakfast every day?A．do, have B．is, having C．does, have D．are, having 48．She is going to be a pilot when she _______.A．will grow up B．grows up C．grow up D．grew up 49．Tom ________ play the guitar now，but he ________ do it at all 3 years ago．A．can，can't B．could，couldn't C．can，couldn't 50．The soup _____. Both of them_____it carefully now.A．smells good; tasteB．smell good; tastingC．smells good; are tasting答案解析部分1．B 2．D 3．D 4．A 5．B 6．D 7．D 8．D 9．C 10．B 11．D 12．C 13．C 14．C 15．B 16．B 17．B 18．D19．B20．D21．A22．D23．B24．C25．B26．C27．B28．C29．A30．A31．C32．D33．A34．D35．A36．A37．C38．D39．B40．B41．B42．B43．D44．C45．A46．D47．C48．B49．C50．C七年级英语：一般现在时专题第一部分:1-50 专项练习第二部分:51-100全面解析1．Lily usually ________ after school. Look! She ________ on the playground now.A．is running; is runningB．runs; is runningC．runs; runs全面解析：莉莉通常放学后跑步。
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必备英语【初中英语】一般现在时专项练习和答案一、初中英语一般现在时1．— Tina the piano in the music club every Sunday?—Yes. From 3:00 p.m. to 4:30 p.m. every Sunday.A. Is; playingB. Does; playC. Did; playD. Will; play【答案】 B【解析】【分析】句意：---蒂娜每个星期天在音乐俱乐部演奏钢琴吗？---是的，每个星期天从下午3点到4点半。
A是现在进行时；B是一般现在时；C是一般过去时；D是一般将来时。
由every day可知本句是一般现在时。
故答案为B。
【点评】考查动词的时态。
注意根据句中的时间状语判断。
2．The children will climb the mountain if it________ tomorrow.A. won't rainB. didn't rainC. isn't rainingD. doesn't rain【答案】 D【解析】【分析】句意：如果明天不下雨，孩子们会去爬山。
if 引导的条件状语从句遵循主将从现的原则，主句用一般将来时，从句用一般现在时，从句是一个否定句，含有实义动词rain的否定句，要借助助动词don't/doesn't构成，主语是it，助动词用doesn't，故选D。
【点评】考查if引导的条件状语的时态。
注意句子涉及到if引导的条件状语从句的用法。
3．Will you get wet if I ______ the experiment?A. will doB. doC. doesD. did【答案】 B【解析】【分析】句意：如果我做实验，你会淋湿吗？if引导的条件状语从句，时态是主将从现，从句主语是 I，故谓语是动词原形，故选B。
【点评】考查时态，注意f引导的条件状语从句，时态是主将从现的用法。
4．Not only my parents but also my sister______ crazy about shopping online.A. amB. isC. areD. be【答案】 B【解析】【分析】句意：不仅我父母，我妹妹也着迷网上购物。
描述客观事实，用一般现在时，not only…but also连接并列的主语时，遵循就近原则，根据my sister，名词单数，be 动词用is，故选B。
【点评】考查动词的时态和形式。
注意一般现在时和主谓一致的用法。
5．It that Yu Mei has changed a lot.A. seemsB. looks likeC. seems likeD. seemed【答案】 A【解析】【分析】句意：于梅似乎改变了很多。
根据has changed，可知现在完成时是对现在的影响，故排除D选项，look like，看上去像，不引导从句，it seems that，固定搭配，看上去好像……，故选A。
【点评】考查固定搭配，注意it seems that的用法。
6．— I'm getting hungry. Do you know where we can get some good food?— Of course! There ____________ a restaurant around the comer.A. will beB. wasC. is【答案】 C【解析】【分析】句意：——我饿了。
你知道在哪我们能买到一些食物吗？——当然！在街角附近有一家餐馆。
句子说的是现在存在的状况，要用一般现在时，故选C。
【点评】考查句子的时态，根据语境选出合适的时态，确保句子通顺。
7．She wants to be a famous singer when she ___________.A. grown upB. growing upC. grew upD. grows up【答案】 D【解析】【分析】句意：当她长大时，她想当一名著名的歌手。
分析句子结构可知，此处是when引导的时间状语从句，when从句应该用一般现在时代替将来时，且此处主语是第三人称单数，所以谓语动词用三单形式，故选D。
【点评】考查一般现在时。
注意when引导的时间状语从句中，when从句应该用一般现在时代替将来时。
8．—Jill is the best singer in my class.—Yes. I think so. No one else ______ so well.A. singsB. sangC. will singD. is singing【答案】 A【解析】【分析】句意：——吉尔在我们班唱歌最好。
——是的，我也这样认为。
没有其他人能唱的如此好了。
根据上句Jill is the best singer in my class.描述的是吉尔的能力，用一般现在时，所以下句也该是一般现在时态。
故选A。
【点评】考查一般现在时态。
注意识记一般现在时态的用法。
9．Millions of people _________ the Great wall every year.A. visitedB. visitC. will visitD. are vesting【答案】 B【解析】【分析】句意：成千万的人每年参观长城。
根据every year，可知句子时态为一般现在时，故答案是B。
【点评】考查一般现在时，注意根据时间状语确定句子的时态。
10．I often _______.She is very kind.A. miss Mr. LiuB. miss Miss LiuC. am missing Miss LiuD. am missing Mr. Liu【答案】B【解析】【分析】句意：我经常想念刘老师。
她很和蔼。
根据句中的often可知应使用一般现在时态，又有下文中的she可知应为女性，故选B。
【点评】考查一般现在时态。
11．— Is your mother a teacher?— Yes, she is. She ________ at a junior high school.A. taughtB. teachesC. will teachD. is teaching【答案】B【解析】【分析】句意：——你的妈妈是位老师吗？——是的。
她在一个初级中学教学。
本题考查一般现在时，主语是单三，故选B。
【点评】本题考查一般现在时及第三人称单数。
12．— How is the weather tomorrow?— I don't know if it ________ tomorrow. If it ________, I'll stay at home.A. will rain; rainsB. rains; will rainC. will rain; will rainD. rains; rains【答案】 A【解析】【分析】句意：——明天天气怎样?——我不知道是否下雨。
如果下雨，我将呆在家里。
第一个if引导宾语从句, 根据tomorrow 用一般将来时; 第二个if引导条件状语从句, 主句用一般将来时, 从句用一般现在时。
故选A项。
【点评】考查动词的时态。
13．I will go camping if it this weekend.A. won't rainB. isn't rainingC. don't rainD. doesn't rain【答案】D【解析】【分析】句意：如果这个周末不下雨我将去宿营。
if引导条件状语从句，在时间，条件，让步状语从句中用一般现在时代替一般将来时，主句用一般将来时态，从句用一般现在时态。
A是将来时态，可排除B是进行时态可排除，C D是一般现在时态，因为从句主语是it，单数形式，故谓语动词用第三人称单数形式，故答案为D。
【点评】本题考查条件状语从句的时态，当主句用一般将来时时，从句用一般现在时态代替一般将来时态。
14．The girl ________ black hair and she ________ of medium height.A. has; hasB. is; hasC. has; isD. is; is【答案】 C【解析】【分析】句意：这个女孩有一头黑发，中等身材。
第一个空格后有hair，头发，名词，要用及物动词，要用has；第二空格后有 of medium height中等身材的，形容词，要用连系动词is。
故选C。
【点评】考查及物动词和连系动词的用法。
注意根据句子结构，选择正确的动词。
15．—Could you go shopping with me?—I'm not sure. But I'll tell you as soon as I ________ my homework.A. finishB. finishedC. will finishD. am going to finish【答案】 A【解析】【分析】句意：——你能和我一起去购物吗？——我不确定。
但我一做完作业就告诉你。
固定短语，as soon as，一......就......引导时间状语从句，主句用一般将来时，从句要用一般现在时，主语是I，谓语动词用原形，故选A。
【点评】考查as soon as引导的时间状语从句的时态。
16．Don't worry. Bill will help you look after your dog when you ________ away on business.A. areB. wereC. will beD. have been【答案】 A【解析】【分析】句意：考查从句中的动词时态。
别担心。
你出差时比尔将帮助你照顾你的狗。
根据主将从现的原则可知该用一般现在时，所以选A。
17．—What does your mother do to keep healthy, Tim?—She usually ____.A. swimB. swimsC. is swimmingD. to swim【答案】 B【解析】【分析】考查实义动词；根据句意：她通常游泳。
A游泳，动词原形；B游泳，动词第三人称单数形式；C正在游泳，现在进行时；D不定式。
由于主语是第三人称单数形式，此句又属于一般现在时，故B项符合。
18．Doing eye exercises ________ one of the useful ways to protect our eyes.A. isB. areC. wereD. be【答案】A【解析】【分析】句意：做眼保健操可以很有效的保护眼睛。