四、易与现在进行时弄混
例：My mother is cooking （cook）when I got home．
答案：was cooking
解析：这两种时态的共同点是都表示动作正在进行，但现在进行时前提是现在，而过去进行时前提是过去，由when I got home可看出前提是过去。
五、易与一般过去时弄混
例：昨晚我在读一本故事书。
I read （read） a story book yesterday evening．
答案：was reading
解析：这两种时态的共同点是都用于表示过去发生的动作。但过去进行时强调动作正在进行，而一般过去时则表示过去某一时间所发生的动作或存在的状态，它表示的动作往往已经完成。“在”说明正在进行，而“I read a story book yesterday evening．”的意思是昨晚我读了一本故事书，言下之意已经读完了。故用过去进行时。
另外，在宾语从句中当主句为过去时，从句若是现在进行时，需变成过去进行时。
e．g． He said that he was drawing a cat at noon yesterday．
自主训练：
（一 ）、单选
1 What ______ from three to four yesterday afternoon?
A have you done B had you done C did you do D were you doing
2 – I call you yesterday evening， but there was no answer．
－ Oh．， I’m sorry I _____ dinner at my friend’s home．
A home B had C was having D have had
3 My mother _____ while my father _____TV．
A cooked； was watching B was cooking； was watching
C was cooked； watched D cooked； watched
4 When I got home， my son _____ the music．
A am listening to B listened to C was listening to D was listening
5 We heard a cry when we ______ TV last night．
A were watching B would watch C watch D watched
6 She asked him whether he _____ back for lunch．
A come B was coming C came D had come
7 Could you tell me when ______?
A she is coming B she was coming C will be come D is he coming
8 The teacher ______ when I came into the classroom．
A is drawing B draws C has drawn D was drawing
9 The pizza ______ by my mother． Would you like to have some?
A makes B was making C made D was made
10 Nobody noticed what she ______ at the moment．
A will do B was doing C has done D had done
11 Was it raining hard when you _____ this morning?
A left B leaves C was leaving D would leave参考答案：
1 D 2 C 3 B 4 C 5 A 6 B 7 A 8 D 9 D 10 B 11 A
（二）、填空
1 ______ they______ （feed） the animals at 5：00 yesterday afternoon?
2 Mrs．Green _____ _____ （not wash） clothes at this time yesterday．
3 Grandpa ______ ______ （mend） his clock when I reached home．
4 As I _____ （walk） in the park， I saw some children playing games．
参考答案：
1 were feeding 2 wasn’t washing 3 was mending 4 was walking