that在定语从句中做什么成分

that指代人或物。在定语从句中作主语、宾语或表语。如
The students that like English often learn from each other. ( that作主语，相当于who )
I saw the girl that you like. ( that作宾语，相当于who或whom )
The car that is over there is mine. ( that作主语，相当于which )
The trees that they planted grow very well. ( that作宾语，相当于which )
He is not that man that he was. (that作表语)

用英文回复邮件：确认没有问题 怎么说？

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We have checked what you mentioned in the email. Everything (it) is confirmed. No problem.

四川大学英文地址

Wangjiang campus: Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu , China, 610065   No.29 Jiuyanqiao Wangjiang Road, Chengdu, 610064 Huaxi Campus: People’s SouthRoad was on the 17th, Chengdu,  610041 Jiang’an Campus: Shuangliu County, Chuanda road , Chengdu, 610207