1)不定代词有all , both, every, each, either, neither, more, little, few, much, many, another, other, some, any , one, no 以及some, something, anything, everything, somebody, someone, anybody, anyone, nothing , nobody, no one, none, everybody, every...
用法:表示从过去某一时间开始一直延续到现在的动作。这个动作可能刚刚结束,也可能仍在继续,并可能延续到将来。(表示到现在为止一直在发生或反复进行的动作) ––– How long have you been waiting here? ––– I have been waiting here for about half an hour. 你...
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