l宾语从句中有or not时不用if引导.
例:I dont know whether the movie star will come or not.
l和不定式连用作宾语时不用if引导.
例:Whether to go there or not hasnt been decided.
C,由wh-引导的宾语从句。连接代词who,whom,whose, what, which,和连接副词when, where, why, how 等连接的宾语从句,它们在句中即有连接从句的作用,又在句中充当句子的成分。
例:Do you know which film they are talking about? (which做定语)
I dont know where he lives. (where 做地点状语)
二,宾语从句的语序,
宾语从句从句的语序必须是陈述语序,既连接词+主语+谓语+其他成分
例:I believe that they will come soon.
He asked me whether I was a teacher.
They wanted to know what they can do for us.
二,宾语从句的时态。
宾语从句的时态受主句的限制,
既:主句是一般现在时态,从句根据实际情况而定。
主句是一般过去时态,从句用相应的过去的时态。如果从句的动作发生在主句之前,则从句要用过去完成时态。
例:
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