Positive Statement Tag Questions

Look at these examples with positive statements. You will see that most of the time, the auxiliary verb from the positive statement is repeated in the tag and changed to negative.

(+) positive statement (-) negative tag
subject auxiliary main verb   auxiliary not personal pronoun same as subject
You are coming,   are n't you?
We have finished,   have n't we?
You do like coffee, do n't you?
You   like coffee, do n't you?
They will help,   wo n't they?
I can come,   can 't I?
We must go,   must n't we?
He should try harder, should n't he?
You   are English, are n't you?
John   was there, was n't he?