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r引導。例如: Whether it is true or not, I can’t tell. (√ ) If it is true or not, I can’t tell. () 3) whether可以引導帶to的不定式。例如: I don’t know whether to accept or refuse. (√ ) I don’t know if to accept or refuse. () 4)whether及其引導的成分可放于介詞之后。例如: I worry about whether I hurt her feelings. (√ ) I worry about if I hurt her feelings. ()