新概念英语57课我想请教新概念英语57的最后一句话,She enjoyed herself making the assistant bring almost everything in the window before finally buying the dress she had first asked for. 请问下那里为什么要用个buying呢?还

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新概念英语57课我想请教新概念英语57的最后一句话,She enjoyed herself making the assistant bring almost everything in the window before finally buying the dress she had first asked for. 请问下那里为什么要用个buying呢?还
新概念英语57课
我想请教新概念英语57的最后一句话,She enjoyed herself making the assistant bring almost everything in the window before finally buying the dress she had first asked for. 请问下那里为什么要用个buying呢?还有最后before后面的都要用完成时态,就像上句的she had first asked for.

新概念英语57课我想请教新概念英语57的最后一句话,She enjoyed herself making the assistant bring almost everything in the window before finally buying the dress she had first asked for. 请问下那里为什么要用个buying呢?还
before是介词,介词后面不能跟动词,buy只能变作名词buying

因为 before是介词

介词后跟宾语,勾成介宾结构,宾语由名词构成,而buy是动词,所以要变成动名词,而动名词就是在动词后加ing,所以用buying