（1）賓語從句中主句和從句的時態(tài)保持一致，但如果從句中表示提示的是客觀現(xiàn)象，雖然主句是過去時態(tài)，從句仍用一般現(xiàn)在時。如：
　　Hello,I didn’t know you were in London. How long have you been here?
　　The teacher told us that light travels at a very high speed.
　�。�2）主語從句作主語相當于單數(shù)第三人稱作主語，謂語動詞用單數(shù)，如果由and 連接兩個或兩個以上的主語從句作主語時，謂語動詞用復(fù)數(shù)；由兩個或多個連接詞引導(dǎo)一個主語從句，謂語動詞用單數(shù)。如：
　　When the meeting will begin has not been decided yet.
　　When they will start and where they go have not been decided yet.
　　When and where the meeting will begin has not been decided.

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