名词性从句知识点拔

I know (that) he studies English every day. （从句用一般现在时）

I know (that) he studied English last term. （从句用一般过去时） I know (that) he will study English next year. （从句用一般将来时） I know (that) he has studied English since 1998. （从句用现在完成时）

当主句动词是过去时态（could, would除外），从句则要用相应的过去时态，如一般过去时，过去进行时，过去将来时等；当从句表示的是客观真理，科学原理，自然现象，则从句仍用现在时态。例如：

I know that he studies English every day.

I knew that he studied English every day.

I knew that he had studied English last term.

I know that he will study English next year.

I knew that he would study English next year.

The teacher told us that Tom had left us for America．

How has he become an expert at planting fruit trees? (The reporter asked the peasant)

The reporter asked the peasant how he had become an expert at planting fruit trees.

Do you know where Doctor Smith lives? Would you tell me what he lost at the railway station?

I wonder why the cinema is closed. Please go and find out when the accident happened.

I want to know what foreign language you can speak.

I’m not sure whose box it is on the floor.

Please tell me how much you paid for the dictionary.

5. think, believe, imagine, suppose等等动词引起的否定性宾语从句中，要把上述主句中的动词变为否定式。即将从句中的否定形式移到主句中。例如： We don’t think you are here, are you? 我们认为你不在这。

I don’t believe he will do so, will he ? 我相信他不会这样做。

6.如果宾语从句后还的宾语补足语，常用it作形式宾语，而将宾语从句后置；如有形式宾语时，连接真正的that 不能省略。

They found it necessary that they master at least one foreign language. They found that they master at least one foreign language necessary.

They found that it is necessary that they master at least one foreign language.

George made it clear that he would go to the front.

7.介词后面的宾语从句：

（1）、连词that引导的名词从句很少作介词的宾语，只用在

but,except,besides 及in 之后。如： I know nothing about him except that he has just come back from London. (2) 介词之后的宾语之句，一般不用which或if 引导，常用

what,whether,when等引导。如：

You should answer for what you have done. I’ll give this book to whoever wants to have it

Mary comes to school by bike except when it rains.

8.形容词后的宾语从句，某些形容词或过去分词后常跟宾语从句，这类形容词或过去分词有afraid, glad, certain, sure, anxious, pleased, surprised 等，that 可省略。如：