英文句子文法

The sentence has nothing wrong in it.

You could write :
Could you send the e-mail to me when you send it to your student?
Could you e-mail it to me when you send it to your student?

Could you send the e-mail to me when you send that to your student?

冇錯~~~

Or you can say:

While you send the e-mail to your student,can you also send to me?

Could you send the e-mail to me when you send that to your student?以上句子中文法同tense 有冇錯? (冇錯) or you can write it this way:
While you are sending the email to the students, please send me a copy as well.

冇問題..
不過如果要更concise..可以咁寫..
Could you send me the email while sending it to your students.
or
Other than sending the email to your students, could you send it to me?