all三者或三者以上全部都,both二者都。all指整体或抽象事物时当做单数,指人时当做复数。both做主语时,谓语动词用复数。 8.many修饰或替代可数名词,much修饰或替代不可数名词 many a 许多(谓语动词用单数) a good/greatmany很多 as many as/asmuch as一样多、差不多 9...
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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