过去进行时(was/were doing)过去进行时表示在某个过去的时间点或时间段正在进行的动作。 They were watching TV when a stranger suddenly rushed in.(当一个陌生人突然冲进来的时候,他...
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...
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