重新标题：关系从句中 that 的省略

定语从句 that 可以省略的情况

定语从句是一种从句，它用来提供有关其先行词的更多信息。定语从句通常以关系代词（如 that、who、which）开头。然而，在某些情况下，“that”可以省略。

省略 that 的情况：

1. 先行词是人或物时

例子：The woman (that) I saw yesterday was very nice. 省略后：The woman I saw yesterday was very nice.

2. 从句之前是介词时

例子：The park (that) we went to was beautiful. 省略后：The park we went to was beautiful.

3. 从句是形容词性从句时

例子：The students (that) are studying are very smart. 省略后：The students studying are very smart.

4. 从句是表示特指的事物时

例子：The book (that) I am reading is very interesting. 省略后：The book I am reading is very interesting.

5. 从句中关系代词用在主语的位置时

例子：The person (that) knows the answer should raise their hand. 省略后：The person knows the answer should raise their hand.

省略 that 的注意事项：

只有在从句中关系代词用在宾语或介词宾语的位置时才能省略 that。 省略 that 后，从句中的时态和语态必须与先行词一致。 如果省略 that 会导致句子含糊不清或产生歧义，则不能省略。

例子：

The book that I bought yesterday is on my desk. (正确) The book I bought is on my desk. (正确) The book I bought on my desk. (错误，含糊不清)

结论：