告诉下以下句子是不是定语从句

问题描述:

告诉下以下句子是不是定语从句
1.Do you know who the teacher is talking to?
2.He is the man that he was.
3.I am sure that the exchange students will enjoy their stay in China

第一句 who 引导的是宾语从句
第二句 that引导的是定语从句
第三句 that引导的 你可以看成宾语从句