當主句為現(xiàn)在時或將來時,賓語從句的時態(tài)一般不受主句的時態(tài)所影響.
當主句為過去時
①從句用一般過去時或過去進行時表示與主句謂語動詞動作同時發(fā)生
I only knew he was studying in a western country,but I didn’t know what country he was in.
我只知道他當時在西方的一個國家讀書,可不知道是哪個國家.
He asked me if I was reading the story The Old Man and the Sea when he was in.
他問我他進來的時候我是否正在讀.
②從句過去完成時表示該動作發(fā)生在主句謂語動作之前
He told me that he had told Mary about the meeting already.
他告訴我他已經(jīng)把有關會議的事情告訴的了Mary.
③從句謂語用過去將來時表示該動作發(fā)生在主句謂語動作之后
The reporter asked if the government would take necessary measures to put down the to-do.
記者問政府是否會采取必要的措施鎮(zhèn)壓騷亂.
如果從句是一個客觀真理,那么從句的時態(tài)不根據(jù)主句的時態(tài)而變化
The teacher said that the moon goes around the earth yesterday.
老師昨天說月亮繞著地球轉.
當賓語從句的引導詞是who,which,what,when,where,how,why等表疑問時,不能按正常語序安排,經(jīng)常將這類引導詞置于句首
Who do you think the public might choose as their favorite singer this year?
你認為今年公眾會選誰為他們最喜歡的歌手.