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这道题是OG原题,网上的解释也很多,就不多说了。首先,were不能表示动作先后顺序。
关于完成时态在这里的用法,manhattan有相关解释。"The Present Perfect can be used in -ing forms, infinitives, or subordinate clauses to clarify an ambiguous sequence in time."
1. She will pay you when you ask her. = She will pay you at the same time as you ask her, or maybe just after.
2. She will pay you when you have taken out the garbage. = She will pay you clearly after you take out the garbage and have proven it.
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