時(shí)態(tài)的運(yùn)用比較復(fù)雜，好多同學(xué)因?yàn)樽鲱}時(shí)不知應(yīng)用哪種時(shí)態(tài)而撓頭皮。其實(shí)你只要把易混的時(shí)態(tài)掌握好，對你來說時(shí)態(tài)就沒有什么難點(diǎn)可言了。而你易混的時(shí)態(tài)無非是一般過去時(shí)和現(xiàn)在完成時(shí)，一般過去時(shí)和過去完成時(shí)的比較罷了。這有何難?看看下面的分析，你會(huì)發(fā)現(xiàn)一切"as easy as A B C"。

　　一般過去式和現(xiàn)在完成時(shí)：

　　一般過去式只是表示事情發(fā)生在過去，陳述一個(gè)事實(shí)，它可以和確定的表示過去的時(shí)間狀語如：last night, in 1999, three days ago等連用。而現(xiàn)在完成時(shí)表示某一完成的動(dòng)作對現(xiàn)在造成的影響或結(jié)果，強(qiáng)調(diào)的是現(xiàn)在的情況，所以它不能和確定的表示過去的時(shí)間狀語連用。

　　如： We have seen that film. 我們已看過那部電影。 對現(xiàn)在造成的影響是我們對影片已有所了解。 We saw the film last night. 昨天晚上我們看了那部電影。只說明昨天晚上看電影這一事實(shí)。

　　注意：有些時(shí)間狀語，如this morning,tonight, this month 等，既可用于一般過去時(shí)，又可用于現(xiàn)在完成時(shí)，但所表達(dá)的意義有所不同。用于現(xiàn)在完成時(shí)表示包括現(xiàn)在在內(nèi)，而用于一般過去式則與現(xiàn)在無關(guān)。如： I have read this book this April.(說話時(shí)仍然為四月。)  I read this book this April. (說話時(shí)四月份已過。)

　　一般過去式和過去完成時(shí)的比較：

　　一般過去式表示過去時(shí)間發(fā)生的動(dòng)作或存在的狀態(tài)，而過去完成時(shí)在過去某一時(shí)間或動(dòng)作之前已完成的動(dòng)作或狀態(tài)，即"過去的過去"。當(dāng)強(qiáng)調(diào)過去某一動(dòng)作發(fā)生在某一動(dòng)作之前時(shí)，常用此時(shí)態(tài)。

　　如： He had finished his homework before nine o'clock.　九點(diǎn)之前他已經(jīng)完成了作業(yè)。實(shí)際上，一般現(xiàn)在時(shí)和過去完成時(shí)常搭配使用。如： When he got home, his daughter had already gone to bed. 當(dāng)他到家的時(shí)候，他的女兒早已去睡覺了。

　　在帶有after和before引導(dǎo)的時(shí)間狀語從句的復(fù)合句中，由于從句的動(dòng)作和主句的動(dòng)作發(fā)生的先后順序已經(jīng)非常明確，所以可以用一般過去時(shí)代替過去完成時(shí)。　如：He called on me soon after he had finished his homework. 他做完作業(yè)后不久便來拜訪我。也可以說： He called on me soon after he finished his homework.

　　哇塞，我們終于學(xué)完了所有時(shí)態(tài)，摩拳擦掌，試試趁熱打鐵！

　　練習(xí)：

　　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 Teacher's Day?

　　--I'm 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. It's nine o'clock 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