注意:只能用whether而不用if的三种情况如下: ①与or not连用:They asked us whether or not we were coming. ②在介词之后:It depends on whether it is going to rain. 3.在不定式之前:We haven’t decided whether to go there. 3. 如果宾语从句原来是特殊疑问句,只...
3.either用于否定句,一般放在句末。如: They don't know the answer, either. 她们也不知道答案。 4.as well as也有"也"的意思。如: We have great mushroom pizza as well as soda. He is a happy boy as well.
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