前肯后否或者前否后肯,hadly、never、less、few等是否定,要注意.Let's用shall we,Let us用will you回答.
如：She is a beautiful girl,isn't she?
It isn't very expensive,is it?
There is less water in the glass,isn't there?
Let's play games together,shall we?
Let us go out now,will you?