高中英语语法-连词(23张PPT)
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英语连词ppt课件
。
避免冗余
在句子中避免使用过多的从属连词 ，以免使句子结构过于复杂和冗余 。
注意语气和语义
从属连词具有不同的语气和语义， 需要根据语境选择合适的连词，以 使句子更加自然、流畅。
04 转折连词
转折连词的种类
01
02
03
04
but：表示意义上的转折 ，常用于对比或强调。
however：表示轻微的 转折，常用于句子的开 头或中间。
连接作用
连词的主要作用是连接句子中的各个部分，使它们形成一个有机的整体。
转折、递进、因果等关系
连词还可以表示转折、递进、因果等逻辑关系，使句子更加丰富和有层次感。
常见英语连词列表
并列连词
and, or, but, so, yet, neither等。
从属连词
that, which, who, whose, whom, when, where, how等。
用于引导从句，如that、 which、who等。
转折连词
用于表示意思的转折，如 however、nevertheless等
。
条件连词
用于表示条件关系，如if、 unless、provided等。
选择连词的用法
01
02
03
04
根据语境选择合适的连词，使 句子意思更加清晰、连贯。
注意连词的正确形式，如时态 、语态等。
转折连词的注意事项
注意转折连词的使用 场合，避免在不适合 的语境中使用。
注意转折连词的搭配 ，避免使用不恰当的 搭配。
注意转折连词的语气 和情感色彩，选择合 适的转折连词来表达 意思。
05 选择连词
选择连词的种类
01
02
03
避免冗余
在句子中避免使用过多的从属连词 ，以免使句子结构过于复杂和冗余 。
注意语气和语义
从属连词具有不同的语气和语义， 需要根据语境选择合适的连词，以 使句子更加自然、流畅。
04 转折连词
转折连词的种类
01
02
03
04
but：表示意义上的转折 ，常用于对比或强调。
however：表示轻微的 转折，常用于句子的开 头或中间。
连接作用
连词的主要作用是连接句子中的各个部分，使它们形成一个有机的整体。
转折、递进、因果等关系
连词还可以表示转折、递进、因果等逻辑关系，使句子更加丰富和有层次感。
常见英语连词列表
并列连词
and, or, but, so, yet, neither等。
从属连词
that, which, who, whose, whom, when, where, how等。
用于引导从句，如that、 which、who等。
转折连词
用于表示意思的转折，如 however、nevertheless等
。
条件连词
用于表示条件关系，如if、 unless、provided等。
选择连词的用法
01
02
03
04
根据语境选择合适的连词，使 句子意思更加清晰、连贯。
注意连词的正确形式，如时态 、语态等。
转折连词的注意事项
注意转折连词的使用 场合，避免在不适合 的语境中使用。
注意转折连词的搭配 ，避免使用不恰当的 搭配。
注意转折连词的语气 和情感色彩，选择合 适的转折连词来表达 意思。
05 选择连词
选择连词的种类
01
02
03
高中英语语法-连词(带习题)(共31张PPT)-经典通用课件资料
A. unless
B. since
C. although
D. when
c
2021/10/10
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1. He is very young, _____ he knows a lot aboCut computer. A. and B. however C. but D. while
2. Excuse me for breaking in, _____ I have some news
2021/10/10
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从属连词
❖ 用以引导名词性(主语、宾语、表语和同位语从句)从句和状语从句(原因、地点、时间、 让步等)的连词，由从属连词所导的句子叫从句。
❖ 引导时间状语从句：when, while, as, before, after, until, till等 ❖ when用引导时间状语从句时， 从句中可使用延续性和非延续性动词。 ❖ 当从句的主语与主句的主语相同时，主语和be动词可省略
2021/10/10
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LOREM IPSUM DOLOR
❖ 15.我昨晚熬夜，所以今天早上我迟到了 ❖ I stayed up last night , so I was late for class this morning ❖ 16.在工作期间他太懒了，所以被他的老板开除了 ❖ He was too lazy during the work ,therefore he was fired by his boss ❖ 17.我爱你，因为你是富二代 ❖ I love you because you are the second-generation rich.
4
•
三表示转折关系的连词
•
but 但是
连词用法讲解ppt课件
As (when, while) I was walking down the street, I noticed a police car in front of Number 37.
6
• ④ when引导的状语从句中的主语与主句主 语一致，从句中是“主语+be动词”结构时， 这时主语和be动词可以省略。例如：
• Whether they will go to the Great Wall is not known.
• The question is whether we can finish the task on time.
• The question whether we will take part in the physics contest has not been decided.
Please keep quiet while (when) others are studying；
② when除可指一段时间外，还可用来指一点时 间，等于 “at the time”，也就是说when引出 的时间状语从句中的谓语动词可以是终止性的， 也可以延续性的。因此主句和从句的谓语可以 是一般时，进行时，或完成时。例如： 5
2）It was (not) +时间段+before+从句（过去 时），意思是“过了一段时间才…/没过一段 时间就…”
It was not long before our hometown was liberated没过多久我们的城镇就解放了。 9
• 3、till, until 用法区别
• 用于否定句时，结构为not …until (till)， 主句谓语动词延续与非延续都可以，意 为“直到…才…”。用于肯定句时，只与 延续性动词连用，表示“到…为止”。
6
• ④ when引导的状语从句中的主语与主句主 语一致，从句中是“主语+be动词”结构时， 这时主语和be动词可以省略。例如：
• Whether they will go to the Great Wall is not known.
• The question is whether we can finish the task on time.
• The question whether we will take part in the physics contest has not been decided.
Please keep quiet while (when) others are studying；
② when除可指一段时间外，还可用来指一点时 间，等于 “at the time”，也就是说when引出 的时间状语从句中的谓语动词可以是终止性的， 也可以延续性的。因此主句和从句的谓语可以 是一般时，进行时，或完成时。例如： 5
2）It was (not) +时间段+before+从句（过去 时），意思是“过了一段时间才…/没过一段 时间就…”
It was not long before our hometown was liberated没过多久我们的城镇就解放了。 9
• 3、till, until 用法区别
• 用于否定句时，结构为not …until (till)， 主句谓语动词延续与非延续都可以，意 为“直到…才…”。用于肯定句时，只与 延续性动词连用，表示“到…为止”。
英语语法连词课件PPT
He was punished today _b_e_c_a_u_s_e_ he didn't finish his homework.
4．车停了才能下车。 Don't get off the bus___u_n_ti_l__ ___it_____ _s_t_o_p_s___. 5．珠海如此美丽以至于很多游客来这里度假。
表示因果关系的并列连词 1．for 表示“因为”时，用来补充说明或表示推测性的理 由，不能置于两个并列分句的句首，只能放在两个分句的中间。 如：
It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面是湿的。
2．so 表示“因此，所以”时，不能与 because 连用。如： He worked hard, so he passed the exam. ＝Because he worked hard, he passed the exam. 他努力学习，所以通过了考试。
Zhuhai is__s_u_c_h___ a beautiful city___th_a_t___ many visitors come here for holidays.
连词主要分为两大类：并列连词和从属连词。并列连词用 来连接平行的词、短语或句子；从属连词是用来引导从句的词。 并列连词按照其在句中的作用可分为表示并列关系、转折关系、 选择关系和因果关系的连词。
whenever (无论什么时 候)
觉。
续表
连词
用法及例句
可用于引导结果状语从句。如：The
mountain was so steep that few people
so...that, such...that (如 此……以至于……)
4．车停了才能下车。 Don't get off the bus___u_n_ti_l__ ___it_____ _s_t_o_p_s___. 5．珠海如此美丽以至于很多游客来这里度假。
表示因果关系的并列连词 1．for 表示“因为”时，用来补充说明或表示推测性的理 由，不能置于两个并列分句的句首，只能放在两个分句的中间。 如：
It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面是湿的。
2．so 表示“因此，所以”时，不能与 because 连用。如： He worked hard, so he passed the exam. ＝Because he worked hard, he passed the exam. 他努力学习，所以通过了考试。
Zhuhai is__s_u_c_h___ a beautiful city___th_a_t___ many visitors come here for holidays.
连词主要分为两大类：并列连词和从属连词。并列连词用 来连接平行的词、短语或句子；从属连词是用来引导从句的词。 并列连词按照其在句中的作用可分为表示并列关系、转折关系、 选择关系和因果关系的连词。
whenever (无论什么时 候)
觉。
续表
连词
用法及例句
可用于引导结果状语从句。如：The
mountain was so steep that few people
so...that, such...that (如 此……以至于……)
高三英语语法连词课件(共21张PPT)
1.On Sundays there were a lot of children playing in the park, _________ parents were seated together joking. 2.On Sundays there were a lot of children playing in the park, _________ parents seated together joking. 3.On Sundays there were a lot of children playing in the park, and _________ parents were seated together joking. A. whose B. their C. who D. they
•
17、儿童是中心，教育的措施便围绕他们而组织起来。上午5时36分41秒上午5时36分05:36:4121.9.6
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You have to believe in yourself. That's the secret of success. 人必须相信自己，这是成功的秘诀。
•
从属连词是指在复合句中引导从句的连结词。
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15、一年之计，莫如树谷；十年之计，莫如树木；终身之计，莫如树人。2021年9月上午5时36分21.9.605:36September 6, 2021
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16、教学的目的是培养学生自己学习，自己研究，用自己的头脑来想，用自己的眼睛看，用自己的手来做这种精神。2021年9月6日星期一5时36分41秒05:36:416 September 2021
still watches the program.
A. yet B. besides C. also D. then
•
17、儿童是中心，教育的措施便围绕他们而组织起来。上午5时36分41秒上午5时36分05:36:4121.9.6
•
You have to believe in yourself. That's the secret of success. 人必须相信自己，这是成功的秘诀。
•
从属连词是指在复合句中引导从句的连结词。
•
15、一年之计，莫如树谷；十年之计，莫如树木；终身之计，莫如树人。2021年9月上午5时36分21.9.605:36September 6, 2021
•
16、教学的目的是培养学生自己学习，自己研究，用自己的头脑来想，用自己的眼睛看，用自己的手来做这种精神。2021年9月6日星期一5时36分41秒05:36:416 September 2021
still watches the program.
A. yet B. besides C. also D. then
连词课件 PPT
考点一 “when” 和 “while”
Mr. White was taking a shower _C____ the UFO
landed on the street. A. where B. while C. when D. whether
While Mr. White was taking a shower，the UFO landed on the street.
either A or B
“或者A或者B” 【连接主语
neither A nor B
“既不A也不B” 时，谓语
not only A but also B “不仅A而且B” “就近原
①Either
you or
I
__a__m_
going
to
the
则”】
party.
(或者你或者我将去晚会。)
②Neither I nor he ___h_a_s_ seen the movie.
when引导的状语从句的动作多为终止性动词， 也为可持续动词；但while只能是可持续动词。
（1） while, when, as 这三个连词都可引导时间状语从句，但用法有所不同。 1) 当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。 例如：
As/When/While I was walking down the street I noticed a police car. 2) 当两个长动作同时进行的时候，最常用的是while。 例如：
While mother was cooking lunch, I was doing my homework. 3) 当两个动作都表示发展变化的情况时，最常用的是as。 例如：
语法填空之连词ppt课件.ppt
advice.
• 9. Mary’s voice was so loud _t_h_a_t_ the students in the back heard her clearly.
• 10. It is _b_e_c_a_u_s_e_ he told a lie that his mother was angry.
连词
并列连词 从属连词
表并列/转折/对比/选择/因果 and/but/while/or/for/so
连词词组 not only…but also, both…and either…or, neither…nor,
名词性从句
主语从句 宾语从句
表语从句
定语从句 状语从句
同位语从句
that, wh-, how, wh-ever, since, as, because, if, although…
• 6. Generally speaking, air will be heavily polluted __w_h_e_r_e_ there are many factories.
• 7. _A_l_t_h_o_u_g_h_ it was very cold, he went on working. • 8. He may fail his test again _u__n_le_s_s_ he follows my
John.
• 4. Our school, _w_h_i_c_h_ is nearly 100 years old, is very famous here.
• 5. This is the mountain village __w_h_e_r_e_ I stayed last year. • This is the mountain village (_w_h_i_c_h_/_th_a_t_) I visited last year.
• 9. Mary’s voice was so loud _t_h_a_t_ the students in the back heard her clearly.
• 10. It is _b_e_c_a_u_s_e_ he told a lie that his mother was angry.
连词
并列连词 从属连词
表并列/转折/对比/选择/因果 and/but/while/or/for/so
连词词组 not only…but also, both…and either…or, neither…nor,
名词性从句
主语从句 宾语从句
表语从句
定语从句 状语从句
同位语从句
that, wh-, how, wh-ever, since, as, because, if, although…
• 6. Generally speaking, air will be heavily polluted __w_h_e_r_e_ there are many factories.
• 7. _A_l_t_h_o_u_g_h_ it was very cold, he went on working. • 8. He may fail his test again _u__n_le_s_s_ he follows my
John.
• 4. Our school, _w_h_i_c_h_ is nearly 100 years old, is very famous here.
• 5. This is the mountain village __w_h_e_r_e_ I stayed last year. • This is the mountain village (_w_h_i_c_h_/_th_a_t_) I visited last year.
高三英语语法复习连词PPT精品课件
• 注意：and 还可以和祈使句或名词词组 连用表示条件。（or也有此用法） Make up your mind, and you'll get the chance. = If you make up your mind, you'll get the chance. One more effort, and you'll succeed.
guitar. 注意： not only… but also 关联两个分句时，一 个分句因有否定词not 而必须倒装。
Not only does he like reading stories, but also he can
even write some. 4) neither…nor 意思为"既不……也不……"谓语 动词采用就近原则，与nor后的词保持一致。
They were not the bones of an animal, but (the bones) of
a human being.
• 表原因关系
1) for 判断改错：
(错) For he is ill, he is absent today. (对) He is absent today, for he is ill. for是并列连词，不能置于含两个并列分句的句子的句首，只 能将其放在两个分句中间。
Neither you nor he is to blame.
• 比较and和or 1) 并列结构中，or通常用于否定句，and用于肯定句。 2) 但有时and 也可用于否定句。请注意其不同特点： There is no air or water in the moon. There is no air and no water on the moon. 在否定中并列结构用or 连接，但含有两个否定词的句子 实际被看作是肯定结构，因此要用and。 典型例题
guitar. 注意： not only… but also 关联两个分句时，一 个分句因有否定词not 而必须倒装。
Not only does he like reading stories, but also he can
even write some. 4) neither…nor 意思为"既不……也不……"谓语 动词采用就近原则，与nor后的词保持一致。
They were not the bones of an animal, but (the bones) of
a human being.
• 表原因关系
1) for 判断改错：
(错) For he is ill, he is absent today. (对) He is absent today, for he is ill. for是并列连词，不能置于含两个并列分句的句子的句首，只 能将其放在两个分句中间。
Neither you nor he is to blame.
• 比较and和or 1) 并列结构中，or通常用于否定句，and用于肯定句。 2) 但有时and 也可用于否定句。请注意其不同特点： There is no air or water in the moon. There is no air and no water on the moon. 在否定中并列结构用or 连接，但含有两个否定词的句子 实际被看作是肯定结构，因此要用and。 典型例题
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for 表推测的原因，句子重心在for前的分句，也可 以表示对主句的看法或解释。 It is going to rain, for it’s getting dark. He may be ill, for he is absent today.
because 和for的区别
1．for 是并列连词，只用于连接表示原因的分句，因此 不能用于句首。because表示原因时，可位于句首。
表示在…之前或在…之后， before & after Turn off the light before you leave.
I often play computer after finishing my homework. 表示自从，直到 since &until
She has studied very hard since she came to our school. 两者区别：1. till不能用于句首 2. 用在否定句中， 表示直到…才， 这个动作直到untill所表示的时候才 发生。
三，表示转折关系的连词 but 但是
he is old, but he is very healthy. however 然而，但是，可放在句首，中，末， 通常用
逗号隔开，作插入语。
My room is small, however, it’s very comfortable. while 然而，而
2. such +名/短语 that… It was such a warm day that we went out for a walk.
注意：such+a/an+形容词+单数名词结构
= so +形容词+a/an+单数名词结构
He told us such a funny story that we all laughed.
The thief was caught as/ when he was stealing in the supermarket. ②as表示 一边……一边……，强调从句和主句中两 个动作交替进行或同步进行。
They talked as they walked. ③as表示随着
As time goes on, it's getting warmer and warmer.
连词
什么是连词? 用于连接单词，短语或句子的词语
并列连词 从属连词
并列连词
表并弄关系的连词： 1. and 和，而且 基本用法：表并列
I like apples and oranges. 祈使句后用and, 有条件句作用 此时and= if you… you will…
because重心在because引导的从句
It’s morning, for the birds are singing. （对，表推断的原因）
It’s morning, because the birds are singing. （错，因为鸟叫不是天亮的直接原因）
但可以说the birds are singing because it’s morning.
unless= if not, 表示反面条件，如果不、除非。 They will go tomorrow unless it rains.
=（They will go tomorrow if it doesn't rain.） I won't let you in unless you show me your pass.
though 较口语，可作副词，且放在句首，句末，意 主为“不过，可是” It is hard work, I enjoy it, though.
二，表示选择关系的连词 1. either…or 要么…要么… 不是…就是… (就近原则)
Either you or I am going there tomorrow. She is either drunk or mad. Either you or she attends the meeting. 2. or 还是，或者，否则 Is she a teacher or a student? Hurry up, or we will miss the bus. 3. otherwise 否则 （可与or 互换） Get up quickly, otherwise you will be late for school.
【误】For he did not obey the rules, he was punished. 【正】Because he did not obey the rules, he was
punished.
2．for 表示的是推断解释，because强调动作发生的直 接原因。
It must have rained last night, for the ground is wet. (不可用because，因为地面湿不是天下雨的原因）
while用来引导延续性动作或状态的从句，强调主从句 的动作同时发生或持续。
①while通常表示一段时间，从句中要用持续性动词作 谓语。
she fell asleep while she was reading the newspaper. ②while有时可以作并列连词，表示对比，可译成……
because 和for的区别
The day breaks, for the birds are singing. (不可用because，因为鸟叫不是天亮的原因）
He went to bed early, because he was tired (直接的理由)
He must be tired, for he went to bed early. (间接的推断)
从属连词
用以引导名词性从句和状语从句的连词，由从属连 词所导的句子叫从句。
引导时间状语从句的： when, while, as, before, after, until, till等
when用来引导长时间的从句时， 从句中用短暂性 动词；用来引导长时间的从句时，用持续性动词。 当从句的主语与主句的主语相同时，be动词可省略
2. so that 为了，以便 I got up early so that I could catch the first bus.
引导结果状语从句的：so… that, such…that… 1. so + 形/副 that…
I am so tired that I can’t walk any longer.
然而…Байду номын сангаас。
I am fond of English while he likes math.
as 引导的从句中多用表示动作的动词，不用be动 词，且多是短暂性或发展变化的情况，可理解为“ 随着”
①as表示点时间时，从句中用短暂性动词；表示段 时间时，用持续性动词。as和when两者经常可以 通用。
引导条件状语从句的连词: if, unless, as long as if 如果，表示在某种条件下某事会发生，也可以表
虚拟或假设
If you ask him, we will help you. If I were you, I won’t do that. as long as 只要 Nothing is impossible as long as we try. There isn't any orange in the bottle.
Until you told me, I have no idea of it. Jim doesn’t go to bed until/till his mother is back. 表示一…就… as soon as, once I will tell you as soon as I hear from her.
When I got home, my family were already having dinner.
（when表示点时间）
When they were still talking and laughing, the teacher
came in. （when表示时间段）
When ( you are) in trouble, ask him for help.
3. neither… nor 既不…也不…, 两者都不… 连接两个并列主语时，谓语动词与最近的主语保持一 致。
Neither I nor he likes this song.
并列连词
4．Not only… but also…不但…而且… (就近原则) Not only the mother but also the children are ill. He not only washed the clothes but also cleaned the room
→ He told us so funny a story that we all laughed.
六，引导让步状语从句的：although, though, even though, even if
although, though 虽然，纵然， 不能与but 连用， 但可与yet连用
although 较正式，不可作副词 Although/though he is old, he is very healthy.
I am good at swimming while he is good at running. yet, 然而，可是
He studied hard, yet he fail the exam.
四，表示因果关系的连词 so 因此，所以 （不能与because连用） therefore 因此，所以 (比so正式，常与and连用) for 因为 与because的区别： for的句子重心在for前的分句，而
because 和for的区别
1．for 是并列连词，只用于连接表示原因的分句，因此 不能用于句首。because表示原因时，可位于句首。
表示在…之前或在…之后， before & after Turn off the light before you leave.
I often play computer after finishing my homework. 表示自从，直到 since &until
She has studied very hard since she came to our school. 两者区别：1. till不能用于句首 2. 用在否定句中， 表示直到…才， 这个动作直到untill所表示的时候才 发生。
三，表示转折关系的连词 but 但是
he is old, but he is very healthy. however 然而，但是，可放在句首，中，末， 通常用
逗号隔开，作插入语。
My room is small, however, it’s very comfortable. while 然而，而
2. such +名/短语 that… It was such a warm day that we went out for a walk.
注意：such+a/an+形容词+单数名词结构
= so +形容词+a/an+单数名词结构
He told us such a funny story that we all laughed.
The thief was caught as/ when he was stealing in the supermarket. ②as表示 一边……一边……，强调从句和主句中两 个动作交替进行或同步进行。
They talked as they walked. ③as表示随着
As time goes on, it's getting warmer and warmer.
连词
什么是连词? 用于连接单词，短语或句子的词语
并列连词 从属连词
并列连词
表并弄关系的连词： 1. and 和，而且 基本用法：表并列
I like apples and oranges. 祈使句后用and, 有条件句作用 此时and= if you… you will…
because重心在because引导的从句
It’s morning, for the birds are singing. （对，表推断的原因）
It’s morning, because the birds are singing. （错，因为鸟叫不是天亮的直接原因）
但可以说the birds are singing because it’s morning.
unless= if not, 表示反面条件，如果不、除非。 They will go tomorrow unless it rains.
=（They will go tomorrow if it doesn't rain.） I won't let you in unless you show me your pass.
though 较口语，可作副词，且放在句首，句末，意 主为“不过，可是” It is hard work, I enjoy it, though.
二，表示选择关系的连词 1. either…or 要么…要么… 不是…就是… (就近原则)
Either you or I am going there tomorrow. She is either drunk or mad. Either you or she attends the meeting. 2. or 还是，或者，否则 Is she a teacher or a student? Hurry up, or we will miss the bus. 3. otherwise 否则 （可与or 互换） Get up quickly, otherwise you will be late for school.
【误】For he did not obey the rules, he was punished. 【正】Because he did not obey the rules, he was
punished.
2．for 表示的是推断解释，because强调动作发生的直 接原因。
It must have rained last night, for the ground is wet. (不可用because，因为地面湿不是天下雨的原因）
while用来引导延续性动作或状态的从句，强调主从句 的动作同时发生或持续。
①while通常表示一段时间，从句中要用持续性动词作 谓语。
she fell asleep while she was reading the newspaper. ②while有时可以作并列连词，表示对比，可译成……
because 和for的区别
The day breaks, for the birds are singing. (不可用because，因为鸟叫不是天亮的原因）
He went to bed early, because he was tired (直接的理由)
He must be tired, for he went to bed early. (间接的推断)
从属连词
用以引导名词性从句和状语从句的连词，由从属连 词所导的句子叫从句。
引导时间状语从句的： when, while, as, before, after, until, till等
when用来引导长时间的从句时， 从句中用短暂性 动词；用来引导长时间的从句时，用持续性动词。 当从句的主语与主句的主语相同时，be动词可省略
2. so that 为了，以便 I got up early so that I could catch the first bus.
引导结果状语从句的：so… that, such…that… 1. so + 形/副 that…
I am so tired that I can’t walk any longer.
然而…Байду номын сангаас。
I am fond of English while he likes math.
as 引导的从句中多用表示动作的动词，不用be动 词，且多是短暂性或发展变化的情况，可理解为“ 随着”
①as表示点时间时，从句中用短暂性动词；表示段 时间时，用持续性动词。as和when两者经常可以 通用。
引导条件状语从句的连词: if, unless, as long as if 如果，表示在某种条件下某事会发生，也可以表
虚拟或假设
If you ask him, we will help you. If I were you, I won’t do that. as long as 只要 Nothing is impossible as long as we try. There isn't any orange in the bottle.
Until you told me, I have no idea of it. Jim doesn’t go to bed until/till his mother is back. 表示一…就… as soon as, once I will tell you as soon as I hear from her.
When I got home, my family were already having dinner.
（when表示点时间）
When they were still talking and laughing, the teacher
came in. （when表示时间段）
When ( you are) in trouble, ask him for help.
3. neither… nor 既不…也不…, 两者都不… 连接两个并列主语时，谓语动词与最近的主语保持一 致。
Neither I nor he likes this song.
并列连词
4．Not only… but also…不但…而且… (就近原则) Not only the mother but also the children are ill. He not only washed the clothes but also cleaned the room
→ He told us so funny a story that we all laughed.
六，引导让步状语从句的：although, though, even though, even if
although, though 虽然，纵然， 不能与but 连用， 但可与yet连用
although 较正式，不可作副词 Although/though he is old, he is very healthy.
I am good at swimming while he is good at running. yet, 然而，可是
He studied hard, yet he fail the exam.
四，表示因果关系的连词 so 因此，所以 （不能与because连用） therefore 因此，所以 (比so正式，常与and连用) for 因为 与because的区别： for的句子重心在for前的分句，而