let's go for a walk,shall we?怎么来肯定或否定的回答这个问题

问题描述:

let's go for a walk,shall we?怎么来肯定或否定的回答这个问题
thanks for your answers.
能不能用 no you'd better not.

ok,let's go
or
I think we'd better...
sorry,i have something to do.
.