I have no idea when he will be back.
The fact that he had not said anything surprised everybody.
1.whether与if的区别
(1)只能用if的情况
①宾语从句是否定句时,只用if,不用whether。
如:
I wonder if it doesn't rain.
②引导条件从句时,只能用if,而不能用whether。如:
Please come to see me if_you_have_time.
易错易混点
(2)只能用whether的情况
①用if 会引起误解,就要用whether。如:
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)
②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。如:
I don't know whether_or_not the report is true.
I don't know whether/_if the report is true or not.
易错易混点
③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。如:
It depends on_whether we have enough time.
They don't know whether_to_go there.
易错易混点
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