⑥ 若用if会引起歧义时，则用whether。如：

Please let me know if you like the book.可理解为：a. Please let me know whether you like the book.请告诉我你是否喜欢这本书。B. If you like the book, please let me know.你如果喜欢这本书，请告诉我。

3)如果宾语从句原来是特殊疑问句，只需用原来的特殊疑问词引导。如：

Could you tell me why you were late for the meeting this morning?

3.时态

含宾语从句的复合句，主、从句谓语动词的时态呼应应包括以下三点内容：

1)如果主句的谓语动词是一般现在时，从句的谓语动词可根据需要，选用相应的任何时态。如：

I don't know when he will come back.我不知道他将何时回来。

He tells me that his sister came back yesterday.他告诉我他姐姐昨天回来了。

2)如果主句的谓语动词是过去时，宾语从句的谓语动词只可根据需要，选用过去时态即一般过去时、过去进行时、过去将来时或过去完成时的某一种形式。如：

①The children didn't know who he was.孩子们不知道他是谁。

②He asked his father how it happened.他问他父亲这件事是如何发生的。

3)如果宾语从句所表示的是客观事实、普遍真理、自然现象或习惯性动作等，不管主句用什么时态，从句时态都用一般现在时。如：

The teacher said that the earth goes round the sun.老师说地球绕着太阳转。

4.注意：

if和when既可以引导宾语从句，也可以引导状语从句，应注意它们在两种从句中的意思和用法的不同。if和when引导宾语从句时，分别意为“是否”和“何时”，其时态应和主句时态相呼应;它们引导状语从句时，意思分别为“如果，假如”和“当……时候”，当主句时态是一般将来时时，其时态用一般现在时。它们常常放在含有状语从句和宾语从句的题干中进行综合考查。如：

—Do you know when he will come back tomorrow ?你知道他明天什么时候回来吗?

—Sorry, I don't know. When he comes back, I'll tell you. 对不起，不知道。当他回来了，我将告诉你。

—I don't know if he will come.我不知道他是否会来。

—He will come if it doesn't rain.如果不下雨，他会来的。

★宾语从句的复合句转化为简单句(六种方法)，使其与原句意思相同(或相近)的试题。

方法一：当主句谓语动词是hope， decide， wish， choose， agree， promise(和主观决定有关)等，且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。例如：

Li Ming hopes he will be back very soon. →Li Ming hopes to be back very soon.

We decided that we would help him. →We decided to help him.

方法二：当主句谓语动词是know， learn， remember， forget， tell(和记忆认知有关)等动词，且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：

She has forgotten how she can open the window. →She has forgotten how to open the window.

注：当主句谓语动词是tell， ask， show， teach等动词，且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：

Could you tell me how I can get to the station? →Could you tell me how to get to the station?

方法三：当主句的谓语动词是order(命令)，require(需要)等时，如果主句和从句的主语不一致，宾语从句可简化为“名词(代词)+不定式”结构。例如：The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.

方法四：某些动词后的宾语从句，可以用介词加动名词(短语)等其他形式简化。例如：

He insisted that he should go with us. →He insisted on going with us.

The poor boy doesn’t know when and where he was born. →The poor boy doesn’t know the time and the place of his birth.

方法五：某些动词后面的宾语从句可转化为“宾语+V-ing形式(作宾语补足语)”结构。例如：Liu Ping found that there was a wallet lying on the ground. → Liu Ping found a wallet lying on the ground.

方法六：动词seem后的宾语从句，也可以用不定式(短语)来简化，但句型需要进行适当的变化。例如：It seemed that the boys were going to win. →The boys seemed to win.

除上述方法外，还有一些特殊句式的转化。例如：

I found that it was difficult to learn English well. →I found it difficult to learn English well.

Soon we found that the ground was covered with thick snow. →Soon we found the ground covered with thick snow.

They found that the box was very heavy. →They found the box very heavy

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