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if和when既能引导时间状语从句,又能引导宾语从句。因此,遇到它们就要认真分析一下,它们究竟属于“两副面孔”的哪一副。如: If it rains tomorrow,I won’t come.(时间状语从句) I don’t know if it will rain tomorrow. (宾语从句) (责任编辑:admin) |
