1.主句是現(xiàn)在時態(tài)或?qū)頃r態(tài)時,賓語從句可用所需要的任何時態(tài)
I think Tom is ill today.我認為湯姆今天病了。(賓語從句用一般現(xiàn)在時)
I think Tom has gone to the doctor’s.
我認為湯姆已經(jīng)去看醫(yī)生了。(賓語從句用現(xiàn)在完成時)
I think Tom went to the doctor’s yesterday.
我認為湯姆昨天去看醫(yī)生了。(賓語從句用一般過去時)
Do you know when we’ll have a football match?
你知道我們什么時候舉行足球賽嗎?(賓語從句用一般將來時)
2.主句是過去時,賓語從句用過去時中的某種時態(tài)
Mr Smith told me that he would come but he was busy.
史密斯先生告訴我他要來,但太忙了。(從句用過去將來時)
Mr Smith told me that he didn’t know the news.
史密斯先生告訴我他不知道這個消息。(從句用一般過去時)
Mr Smith told me that he had known the news already.
史密斯先生告訴我他已經(jīng)知道這個消息了。(從句用過去完成時)
I knew she was studying English in this school in the years from 1985 to 1987.
我知道從1985年到1987年期間她在這所學校學習英語。(從句用過去進行時)
I knew that he had been working here since 1960.
我知道他自1960年以來就一直在這里工作。(從句用過去完成進行時)
【提示】 如果賓語從句表示的是一般真理或習慣性行為,則使用一般現(xiàn)在時。
The students knew that water consists of oxygen and hydrogen.
學生們都知道水是由氧和氫構(gòu)成的。