Unit_5_What_were_you_doing_when_the_rainstorm_came？_教案

常用的句型：begin to do与begin doing
一般来说，begin to do和begin doing可以互换，但在以下三种情况下，用to do。

I. 主语不是指人，而是it等。

如：It began to rain.
II. begin后接表示心理活动的词。

如：begin to know（believe, wonder, think）III. begin本身是ing形式，为避免重复后接to do。

即：beginning to do
一、过去进行时中的when和while
when和while都可表示“当……的时候”，引导时间状语从句。

请仔细观察下面的例句，然后补全空格中的内容。

①I was walking to school when I saw a cat in a tree.
②When Sally arrived home, her mother was cleaning the house.
主句的动作是持续性的，而从句动作是短暂性的，此时用_______引导
时间状语从句，主句用_____________时态，从句用一般过去时态。

③While I was sleeping in the bedroom, someone knocked at the door.
④David fell while he was riding his bike.
主句的动作是短暂性的，从句的动作是持续性的，此时用_________
引导从句，主句用____________时态，从句用过去进行时态。

⑤While Andy was waiting for the bus, he was reading a newspaper.
⑥He was cleaning his car while I was cooking.
主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都
是持续性的，此时用_________引导从句，而且主句和从句都用
_____________时态。

when, while
1. 由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；
由while引导的时间状语从句，主句用一般过去时，从句应用过去进行时。

When the teacher came in, we were talking.
当此句改变主从句的位置时，则为：
While we were talking, the teacher came in.
2. 如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while
引导。

如：They were singing while we were dancing.
二、过去进行时
1. 概念: 表示过去某个时刻或过去一段时间正在进行的动作。

2. 句子结构: 主语 + was/were + doing sth. + 时间状语
3. 时间状语词: at 5:00 yesterday afternoon, at that time, then 等连用, 或者用另一动作来表示过去的时间。

如：
They were playing basketball when she arrived.
While they were playing basketball, she arrived.
过去进行时着重描述当时正在持续进行的动作，它的特点是：暂时，持续和未完成，强调过程；一般过去时表示发生过的动作或存在的状态，即表示动作发生过，而且已经结束了，强调结果。

1) Shirley ______ a book about China last year but I don’t know whether she had
finished it ．
A. has written
B. wrote
C. had written
D. was writing
2) Mary ____ a dress when she cut her finger. A. made B. is making
C. was making
D. makes
3) He _______ (write) a letter, then went to bed.
过去进行时侧重表示动作延长的时间长度; 一般过去时表示过去某时发生过某事，侧重说明事实。

He ___________ all night last night. （生动的描写，他一直写……）
He ________ something last night ．
（说明他写了……的事实）
注：下列几类动词通常不用过去进行时。

① 表示状态的动词 be ； ② 感官动词：feel, hear, see, smell, taste 等;
③ 表示思维或心理状态的动词：believe (认为), forget, consider, know, remember, hope, wish, want 等；
④ 表示所属关系的动词：belong, have, own, hold (容纳)等。

C
D wrote was writing。