一．过去进行时：
1.定义：过去进行时表示过去某一时刻或某一段时间正在进行的动作；也表示过去某段时间一直存在的状态；
2.形式：was/were + doing
3.常与表示过去的时间状语连用:
(1) this time yesterday/last week… 昨天或上个周……的这个时候；
(2) then那时；
(3) at that time在那个时候；
(4) at that moment在那个时刻；
(5) at 6 p.m. yesterday在昨天下午6:00；
(6) at the time of…在……的这个时候；
(7)when +过去时等。
e.g. I was watching TV when he called me up.
They were building a bridge this time last year.
They were expecting you yesterday.
He was reading when the rainstorm came.
While Mary is sleeping, Tom is doing his homework.
4.过去进行时中肯定句，否定句和一般疑问句的转换规则及一般疑问句的肯定及否定回答。
e.g.(1)肯定句： We were doing my homework.
否定句：We were not (weren’t) doing my homework.
一般疑问句：Were you doing your homework?
肯定回答： Yes, we were.
否定回答：No, we weren’t.
(2)肯定句：She was working.
否定句：She wasn’t working.
一般疑问句：Was she working?
肯定回答：Yes, she was.
否定回答：No. she wasn’t.
5. 动词-ing形式的变化过则：
(1)动词ing形式的规则变化:
①一般情况下，直接加-ing;
e.g. go----going
ask ----asking
look----looking
carry—carrying
②以不发音的e结尾的动词，去e加-ing;
e.g. write----writing
make----making
take----taking
move—moving
live—living
leave—leaving
③以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这个辅音字母，再加-ing；
e.g. get----getting
sit----sitting
put----putting
run----running
begin----beginning
plan—planning
cut—cutting
get—getting
beg—begging
(2)动词ing形式的不规则变化：
①die----dying
lie----lying
tie----tying
②picnic----picnicking
panic----panicking
③listen----listening
develop----developing
二. 单项选择题专练：......
