I think you should finish your homework first改成否定句是改don’t还是改shouldn't?

I think you should finish your homework first改成否定句是改don’t还是改shouldn't?

I don't think you should finish your homework first.
否定前置

I don't think you should finish your homework first。

根据语法否定前置，应该改don’t。
希望能帮到你。

用don't
因为此处有think.否定要用在think 前。
I don't think....

改don't,否定前移

I don't think you should finish your homework first。 借助助动词don’t