for变on，you变they。
1、We have great faith and high hopes for改成onher.
2、An important thing for the student to remember is that when writing a paper,you改成they，代词错了should not plagiarize.
用法
1）人称代词的主格在句子中作主语或主语补语，例如：
John waited a while but eventually he went home.约翰等了一会儿，最后他回家了。
2）人称代词的宾格在句子中作宾语或介词宾语，但在口语中也能作主语补语，第一人称在省略句中，还可以作主语，例如：
I saw her with them,at least,I thought it was her.
我看到她和他们在一起，至少我认为是她。（her做宾语，them做介词宾语，her做主语补语）