e.g. I wonder if it doesnt rain.
②用if 会引起误解,就要用whether。
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 dont know whether or not the report is true.
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.
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