不用做晚饭给我们。用英语怎么说.?

You don't have to make dinner for us, we're going out.

不用做晚饭给我们.我们要出去.
We are going to have supper outside. So there is no need for you to prepare it for us.

You don`t necessarily cook dinner for us for we have planned to eat out .

No necessity of cooking us dinner, we're going out.