在定语从句中,"what" 通常用于引导非限制性定语从句,特别是当先行词是不定代词或整个句子时。以下是一些具体情况:
1. 先行词是不定代词:
当先行词是all, anything, everything, something, nothing, little, much, few, fewest等不定代词时,定语从句通常用"what"引导。
例如:The book that you gave me is what I needed.
2. 先行词是整个句子:
当定语从句用来补充说明整个句子时,也用"what"引导。
例如:What you said was very important.
3. 其他情况:
当先行词是不定代词或整个句子,且定语从句中缺少主语或宾语时,也可以用"what"。
例如:The man who is talking to me is what I was looking for.
"what" 在定语从句中不充当任何成分,它只是引导从句的连词。在从句中,"what" 通常需要根据从句的语法结构来决定它的作用,比如充当主语、宾语或表语等。
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