在妈妈回来之前我必须完成作业 用英语怎么写

在妈妈回来之前我必须完成作业 用英语怎么写
在妈妈回来之前我必须完成作业 用英语怎么写

在妈妈回来之前我必须完成作业 用英语怎么写
I must finish my homework before my mother comes back.

I should finish my homework before my mother came

I have to finish my homework before my mother coming.

I must finish my homework before my mother comes back.

I must finish the homework behind my mother coming back.