the teacher asked us to do an exercise,in which he would say

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/24 21:16:57

the teacher asked us to do an exercise,in which he would say a word or two and each student would do (their )best to copy
这句话应该怎么翻译?这是一个非限制性定语从句吗?为什么先行词用in which 呢?
括号中的their应该改成his 还是his/her ,英语中不知性别时应该用his还是his/her

老师曾经（注意是过去时）要求我们做过一个练习,在这个练习中,他会说一或两个词,学生尽量把他说的词（这是原文有意思但没字面的,所以要加上）写下来.
关于限定和非限定,其实很简单,就是理解限定的含义.1.限定性定语从句:从句不能省略,如果省略整个句子意思不完整.
非限定性定语从句:从句可以省略,如果省略整个句子意思仍然完整 .
2.限定性定语从句:先行词可以用that 引导.
非限定性定语从句:先行词不可以用that 引导.
3.限定性定语从句:引导词有时可以省略.
非限定性定语从句:引导词不可以省略.
4.限定性定语从句:主句与从句不需要用逗号隔开.
非限定性定语从句:主句与从句需要用逗号隔开.
5.限定性定语从句:从句只修饰先行词.
非限定性定语从句:从句即可以修饰先行词,也可以修饰整个句子或句子的一部分.
因为前面是each student,单数,所以用his,.不知性别非正式体用his,很正式的用his/her.

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