1. 宾语从句的定义：

　　2. 宾语从句的连接词：

　　引导宾语从句的连词有that、whether、if;连接代词主要有who、whom、whose、which、what;连接副词主要有when、where、why、how等。

　　3. whether与if用法区别

　　whether与if在表示“是否”、引导宾语从句时常可通用。但以下情况下只能用whether

　　1)介词后的宾语从句用whether引导

　　例：We’re talking about whether we can get the chance.

　　2)whether引导宾语从句时可以与or not连用

　　例：I don’t care whether the work will take long or not.

　　3)whether引导的宾语从句可置于句首

　　例：Whether they will join in the picnic I don’t care.

　　4)在不定式前，只有whether

　　例：I am just wondering whether to stay for another hour or jus start off right away.

　　4. 宾语从句之主句与从句时态一致

　　补充内容：

　　主句若为过去时态，从句要用相应的过去时态。

　　1)从句用一般过去时或过去进行时表示与主句谓语动作同时发生。

　　例：I only knew Cathy was studying in a western country, but I didn’t know

　　what country she was in.

　　2)从句用过去完成时，表示该动作发生在主句谓语动作之前。

　　例：Carol told me that she had told Sally about the meeting already.

　　3)从句谓语用过去将来时，表示该动作发生在主句谓语动作之后。

　　例：He told me that he would take part in the high jump.

　　5. 宾语从句的简化

　　宾语从句的简化有三种情况：

　　1)当主句谓语动词是find, see, watch, hear等感官动词时，从句常简化为“宾语+宾语补足语”结构，宾语补足语为不带to的不定式或V-ing形式。

　　例：She found that the wallet lay/was lying on the ground.

　　= She found the wallet lie/lying on the ground.

　　2)当主语谓语动词是hope, wish, decide, forget, plan, agree等，且主句主语与从句主语相同时，从句可简化为不定式结构。

　　例：She agreed that she could help me with my maths.

　　= She agreed to help me with my maths.

　　3)在连接代词/副词引导的宾语从句中，当从句主语与主句主语或间接宾语一致时，宾语从句可简化为“连接代词/副词+不定式”结构。

　　例：Can you tell me how I can get to the station?

　　= Can you tell me how to get to the station?