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 [-]			notes:
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?	You (do) like...*
They	will	help,		wo	n't	they?	won't = will not
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?	no auxiliary for main verb be present & past
John		was	there,	was	n't	he?	no auxiliary for main verb be present & past

*Note that in this example the auxiliary verb do in the statement - "You like coffee," - is understood and not expressed because the tense is normal present simple. But the question tag uses the do auxiliary to make "don't you?" It is also possible to say: "You do like coffee, don't you?"

Let's now look at negative statement tag questions.