八年级下册Unit 5 Grammar focus

What was Jenny doing While Linda was sleeping, while Linda was sleeping? Jenny was helping Mary with her homework,
Look at the table and write sentences 4a with both while and when.
What was he doing when the rainstorm came? What was Ben doing when it began to rain heavily? He was reading in the library when the rainstorm came. When it began to rain, Ben was helping his mom make dinner.
When和while的根本区别
when后面既可以接ing, 也可以不接ing; while后面只能____ a dress when she cut her finger. A. made B. is making C. was making D. makes 解析： 割伤手指是已发生的事情，应用过 去时。同时，when表时间的同时性，“玛 丽在做衣服时”提供事情发生的背景，因此 用过去进行时。
John take photos play the piano Mary buy a drink leave the house
clean his room
shop
Turn on the radio
Take the car to the car wash
While John was taking photos, Mary bought a drink. John was taking photos when Mary bought a drink.
I was writing a letter when he came in. 当他进来时，我正在写信。 The telephone rang while she was washing. 当她正在洗衣服时，电话响了。 [kən'tɪnjʊəlɪ] (3) 过去进行时常与always, continually等连 用, 表示过去反复发生的行为动作，带有赞美、 厌烦等感情色彩。如： He was continually asking her questions. 他一直在问她问题。
or while.
C my desk-mate with her — Miss Lin _____ lessons when I left school. —She is really a nice teacher.（2015福州） A. helps B. is helping C. was helping (2011•梧州) I met a good friend of mine while I _______ on the street． C A. walks B. walk C. was walking D. am walking
特殊用法 (1)常用于介绍故事的背景。如: [dezət] Once an Arab was traveling in the desert. 从前, 有个阿拉伯人在沙漠中旅行。 (2) when引导的从句表示一个短暂的时间点, 谓语动词用一般过去时, 主句用一般过去时或 过去进行时； while引导的从句表示一段持续 的时间, 主句为一般过去时, 从句谓语动词用 过去进行时。如：
2. 过去进行时的基本用法:
(1)表示过去某一时刻或某一段时间内正在 进行的动作, 常与时间状语at that time, at that moment, at this time yesterday, at在那一瞬 ten o’clock yesterday等连用。如： Were you playing basketball at four yesterday afternoon? 昨天下午四点你们在打篮球吗?
Unit 5 What were you doing when the rainstorm came?
Grammar focus
What were they doing when it began to rain? They were playing computer games when it began to rain.
They were playing chess when it began to rain. They were playing football when it began to rain.
当…时候
While Jake was sleeping, what did his brother do? He played basketball.
否定句:主语+ was / were + not + 动词-ing形式 I wasn’t reading at this time yesterday. 昨天这个时候我没在看书。
疑问句: (1)一般疑问句: was / were + 主语+ 动词ing形式。 肯定回答: Yes, 主语+ was / were. 否定回答: No, 主语+ wasn’t / weren’t. 如： —Were you reading at this time yesterday? 昨天这个时候你在看书吗？ — Yes, I was. / No, I wasn’t. 是的, 我在看。/ 不, 我没在看。
while I ______ was making At 7:00 a.m., I woke up. _______ my breakfast, my brother _______ listening to the was While radio. __________ I was eating, the radio news talked about a car accident near our home. My brother and I went out right away to have a look. When we got to the place of the accident, the _______ was car ______in bad shape from hitting a tree. But luckily, the driver _______ fine. The roads was were ________ icy because of the heavy snow from the [‘aɪsɪ] adj. 覆盖着冰的， night before. 其名词形式为ice
While John was shopping, Mary took the car to the car wash. / John was shopping when Mary took the car to the car wash.
4b Fill in the blanks with was, were, when
While John was playing the piano, Mary left the house. / John was playing the piano when Mary left the house. While John was cleaning his room, Mary turned on the radio. / John was cleaning his room when Mary turned on the radio.
when 和while 的区别
1) 若从句是一个短暂性动作，主句是一个 持续性动作，可用 when 但不用 while： It was raining hard when we arrived. 我们到达时正下着大雨。 2) 表示主、从句正在进行的动作或状态的 对比时多用while： While she was making a phone call, I was writing a letter.
过去进行时与一般过去时的区别
一般过去时与过去进行时的动作都是 发生在过去。一般过去时强调动作的发
生或状态的存在在过去；而过去进行时
强调动作正在进行的延续性，其结构:
was / were +v.-ing
试比较:
I got up at five the day before yesterday.
Grammar Focus
What were you doing at eight last night? I was taking a shower.
What was she doing at the She was doing her homework. time of the rainstorm?
3) when 可用作并列连词，表示“这时(突 然)”，但while不可以；while 可以用作并列 连词，表示“然而、却”(表示对比)，但 when没有这种用法。 We were about to start when it began to rain. 我们正要出发，这时天要下雨了。 He likes coffee, while she likes tea. 他喜欢咖啡，然而她喜欢茶。
While Jake was sleeping, his brother played basketball.
He was singing.
While he was singing, the baby started to cry. He was singing when the baby started to cry.
while
while引导的时间状语从句常指一个时间段, 从句中的动词常为延续性的。while有时还 可表示主句的动作与从句的动作同时发生。 While he was reading, the phone rang. 他正在看书时，电话铃响了。 Some students were reading while others were writing. 一些学生在读书，另一些学生在写字。