I dont 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 dont 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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