Don't drop math, it is very important.

不要放弃数学，它很重要。

youdao

I want to drop math because it's too hard for me.

我想放弃数学，因为它对我来说太难了。

youdao

He told us the reason why he wanted to drop his math.

他告诉了我们他为什么要放弃数学的原因。

youdao

He told us the reason why he wanted to drop his math.

他告诉了我们他为什么要放弃数学的原因。

youdao