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语法讲解:名词性从句(2)


    e.g. Please let me know whether you want to go.(此句如果把whether改成if,容易当成条件句理解)
    (3)宾语从句中的whether 与or not直接连用,就不能换成if;不直接连用,可换。
    e.g. I don‘t know whether or not the report is true.
    I don’t know whether/ if the report is true or not.
    (4)介词后的宾语从句要用whether引导。whether 可与不定式连用。whether也可引导主语从句、表语从句、同位语从句,还可引导让步状语从句,以上均不能换成if.但引导条件从句时,只能用if,而不能用whether.
    e.g. It depends on whether we have enough time.
    They don‘t know whether to go there.
    Please come to see me if you have time.
    五、同位语从句
    同位语从句在句中作某一名词的同位语,一般位于该名词(如:news, fact, idea, suggestion, promise等)之后,说明该名词的具体内容。
    e.g. I have no idea when he will be back.
    The fact that he had not said anything surprised everybody.
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