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在学习英语的过程中，我们经常会遇到定语从句。而在定语从句中，引导词的使用是非常重要的。不过，在某些情况下，我们也可以省略定语从句中的引导词。
那么，什么情况下可以省略定语从句中的引导词呢？以下是几种常见的情况：
1. 关系代词“that”省略
当关系代词“that”在定语从句中作宾语时，可以省略。例如：
- The book that I borrowed from the library is very interesting.
- The book I borrowed from the library is very interesting.
2. 关系代词“who”、“which”、“whom”省略
当关系代词“who”、“which”、“whom”在定语从句中作主语或宾语时，可以省略。例如：
- The man who is standing over there is my father.
- The man standing over there is my father.
- The book which I bought yesterday is very expensive.
- The book I bought yesterday is very expensive.
- The person whom I met at the party is my friend.
- The person I met at the party is my friend.
3. 关系代词“whose”省略
当关系代词“whose”在定语从句中作定语时，可以省略。例如：
- The girl whose mother is a teacher is very smart.
- The girl her mother is a teacher is very smart.
需要注意的是，以上情况的省略只适用于口语和非正式的书面语。在正式的书面语中，最好不要省略定语从句中的引导词。
总之，掌握定语从句引导词的省略规则，可以帮助我们更好地理解和运用英语。希望本文对大家有所帮助！
