但是我有许多作业没写英语怎么说

But I have many homework left undone.
But I didn't finish my homework.

homework 不可数 不能用 many
所以要么
a lot of 修饰可数不可数都行
要么用much
I have much homework to do.
I have a lot of homework to do.

But I still need to do a lot of homework.

But I have a lot of homework unfinished

but i have a lot of homework to do

But I have a lot of homework to do.