一、引导词的使用

　　1. 当宾语从句由陈述句变化而来时，用that来引导从句，that常无具体意义，一般可省略。例如：

　　Lin Tao thought（that）the TV play was very boring.

　　2. 当宾语从句是由一般疑问句变化而来时，要用if或whether来引导从句。例如：

　　David asked his mother if/ whether she liked the dinner last night.

　　3. 当宾语从句是由特殊疑问句变化而来时，原句中的疑问词充当连接代词（如who， whose， what， which）或连接副词（如when， where， why， how），引导宾语从句。例如：

　　Do you know what we can do on the island？

　　I don’t know why Jane was late for school this morning.

　　二、语序的陈述化

　　宾语从句一般要用陈述句语序。例如：

　　When did he leave？ I want to know. →I want to know when he left.

　　Does the shop close at six every day？ Do you know？ →Do you know if/ whether the shop closes at six every day？

　　三、时态的呼应

　　1. 如果主句是一般现在时、一般将来时或祈使句时，宾语从句可根据情况使用各种时态。例如：

　　I hear she is here today（she was here yesterday/ she will be here tomorrow.）

　　2. 如果主句是一般过去时，宾语从句应使用过去时态的某种形式。例如：

　　He said he was watching TV（he had swept the floor/ he would play football after school）。

　　3. 如宾语从句所叙述的是客观事实、自然现象或科学真理等，从句不受主句时态限制，仍用一般现在时。例如：

　　Our teacher told us that light travels faster than sound.

　　四、否定转移

　　当主句的谓语动词为think， believe， suppose等动词，且主语为第一人称时，从句的否定要转移到主句上。例如：

　　I don’t believe he is here on time， is he？

　　I don’t think Tom is the best student in his class， is he？