三、主句與定語(yǔ)從句時(shí)態(tài)的一致1.如果主句的時(shí)態(tài)是現(xiàn)在時(shí),從句可用所需要的任何時(shí)態(tài)People who take physical exercise live longer.... [查看全文]
二、主句與狀語(yǔ)從句時(shí)態(tài)的一致1.“主過(guò)從過(guò)”原則:主句是過(guò)去時(shí)態(tài),從句一般也用過(guò)去的某種時(shí)態(tài)When I was a student,my teacher o... [查看全文]
一、主句和賓語(yǔ)從句時(shí)態(tài)的一致1.主句是現(xiàn)在時(shí)態(tài)或?qū)?lái)時(shí)態(tài)時(shí),賓語(yǔ)從句可用所需要的任何時(shí)態(tài)I think Tom is ill today.我認(rèn)為湯姆今天... [查看全文]
九、過(guò)去將來(lái)時(shí)1.基本用法:表示過(guò)去某一時(shí)間將要發(fā)生的動(dòng)作或狀態(tài)He told us he would help us.他告訴我們他會(huì)幫助我們。I knew y... [查看全文]
八、將來(lái)完成時(shí)1.基本用法(1)表示未來(lái)某時(shí)之前或未來(lái)某動(dòng)作前已經(jīng)完成之動(dòng)作。By the end of this week,I shall have finished... [查看全文]
七、過(guò)去完成時(shí)1.基本用法(1)表示在過(guò)去某時(shí)或過(guò)去另一動(dòng)作之前所完成的動(dòng)作,即“過(guò)去的過(guò)去”。She had learned English before s... [查看全文]
六、現(xiàn)在完成時(shí)1.基本用法(1)表示現(xiàn)在為止剛剛完成的動(dòng)作。He has bought a new car recently.他最近買了輛新車。I haven’t hea... [查看全文]
五、過(guò)去進(jìn)行時(shí)1.基本用法(1)表示在過(guò)去某一時(shí)刻正在進(jìn)行的動(dòng)作。I was having dinner at 8 yesterday evening.昨晚八點(diǎn)我正在吃... [查看全文]
四、現(xiàn)在進(jìn)行時(shí)1.基本用法(1)表示現(xiàn)在正在進(jìn)行的動(dòng)作。I am writing a letter to my brother.我正在寫封信給我哥哥。It is stil... [查看全文]
三、一般將來(lái)時(shí)1.基本用法(1)表示將來(lái)的動(dòng)作或狀態(tài)。Tom will be five years old in a few days.湯姆過(guò)幾天就五歲了。You will... [查看全文]