时态的运用比较复杂，好多同学因为做题时不知应用哪种时态而挠头皮。其实你只要把易混的时态掌握好，对你来说时态就没有什么难点可言了。而你易混的时态无非是一般过去时和现在完成时，一般过去时和过去完成时的比较罢了。这有何难?看看下面的分析，你会发现一切as easy as A B C。
一般过去式和现在完成时：
一般过去式只是表示事情发生在过去，陈述一个事实，它可以和确定的表示过去的时间状语如：last night, in 1999, three days ago等连用。而现在完成时表示某一完成的动作对现在造成的影响或结果，强调的是现在的情况，所以它不能和确定的表示过去的时间状语连用。
如： We have seen that film. 我们已看过那部电影。 对现在造成的影响是我们对影片已有所了解。 We saw the film last night. 昨天晚上我们看了那部电影。只说明昨天晚上看电影这一事实。
注意：有些时间状语，如this morning,tonight, this month 等，既可用于一般过去时，又可用于现在完成时，但所表达的意义有所不同。用于现在完成时表示包括现在在内，而用于一般过去式则与现在无关。如： I have read this book this April.(说话时仍然为四月。) I read this book this April. (说话时四月份已过。)
一般过去式和过去完成时的比较：
一般过去式表示过去时间发生的动作或存在的状态，而过去完成时在过去某一时间或动作之前已完成的动作或状态，即过去的过去。当强调过去某一动作发生在某一动作之前时，常用此时态。
如： He had finished his homework before nine oclock. 九点之前他已经完成了作业。实际上，一般现在时和过去完成时常搭配使用。如： When he got home, his daughter had already gone to bed. 当他到家的时候，他的女儿早已去睡觉了。
在带有after和before引导的时间状语从句的复合句中，由于从句的动作和主句的动作发生的先后顺序已经非常明确，所以可以用一般过去时代替过去完成时。 如：He called on me soon after he had finished his homework. 他做完作业后不久便来拜访我。也可以说： He called on me soon after he finished his homework.
哇塞，我们终于学完了所有时态，摩拳擦掌，试试趁热打铁!
练习：
1. Zhao Lan ____ already ___ in this school for two years.
A. was...studying
B. will ... study
C. has ...studied
D. are studying
2. They usually _____ TV in the evening.
A. watch
B. will watch
C. are watching
D. watches
3. Judy _____ the Great Wall twice, and now she still ______ to go there.
A. went to , wanted
B. goes to , wants
C. has gone , wants
D. has been to, wants
4. She will find him a kind man when she _______ more about him.
A. knows
B. know
C. will know
D. is going to know
5. --What are you going to give our teacher for Teachers Day?
--Im not sure. Maybe I _____ him some flowers.
A. have given
B. will give
C. gave
D. give
6. --Tom ______ out.
--Oh, is he? What time _____ he _____ out?
A. is, did, go
B. went, is ,going
C. has gone, did, go
D. is going, does, go
7. Its nine oclock now, they ______ an English class.
A. have
B. are having
C. having
D. will have
8. -- Where is Li Lei?
-- He _______ his sports shoes in the room. He ______ football with his friends.
A. is putting on , is playing
B. puts on, will play
C. is putting on , will play
D. put on, played
9. Miss Smith with her parents ______ China since _________.
A. have been in , two years ago
B. has gone to, two years
C. have been to, two years
D. has been in, two years ago
10. When I knocked at the door, my mother _______.
A. is cooking
B. cooked
C. was cooking
D. cooks
实践：
1. Jacks father is ______ doctor.
A. a
B. an
C. some
D. /
2. He often does some washing ______ Sunday.
A. at
B. in
C. on
D. by
3. This room is ours, and that one is ________.
A. they
B. them
C. their
D. theirs
4. Tom is _______ boy in his class.
A. tall
B. taller
C. tallest
D. the tallest
5. Can you come here next Friday?
Sorry, I _______.
A. cant
B. mustnt
C. neednt
D. may not
6. Did you ______ the football match last night?
A. see
B. watch
C. look
D. read
7. There ________ many high buildings in this city.
A. is
B. are
C. have
D. has
8. John has two brothers. One is an artist, ________ is a scientist.
A. the others
B. another
C. the other
D. others
9. The man asked the policeman _______.
A. let hime to go
B. to let him to go
C. let him go
D. to let him go
10. Please _______ page 54 and read lesson Twelve.
A. turn to
B. turn into
C. turn in
D. turn on
11. He did not go home ______ he finished the work.
A. of
B. because
C. until
D. since
12. The old man was _______ tired that she couldnt walk on.
A. so
B. too
C. very
D. quite
13. We are busy ________ our lessons these days.
A. prepare
B. preparing
C. to prepare
D. prepared
14. Ill go with you if I ________ free tomorrow.
A. will be
B. shall be
C. am
D. was
15. Do you know ________?
A. where does he live
B. where he lives
C. he where lives
D. he lives where
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