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.
*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.