when和where引导的同位语从句与定语从句的区别。when 和where前面的名词若是表示时间、地点的名词,则when和where引导的是定语从句,否则则为同位语从句。如:They put forward the question where they could get the money.
This is the place where the accident happened.
2、名词性从句中主句和从句的时态一致
宾语从句中主句和从句的时态保持一致,但如果从句中表示提示的是客观现象,虽然主句是过去时态,从句仍用一般现在时。如:
Hello,I didnt know you were in London. How long have you been here?
The teacher told us that light travels at a very high speed.
主语从句作主语相当于单数第三人称作主语,谓语动词用单数,如果由and 连接两个或两个以上的主语从句作主语时,谓语动词用复数;由两个或多个连接词引导一个主语从句,谓语动词用单数。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.
3、名词性从句的词序
名词性从句在句中要用陈述句语序。如:
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