Tag Endgings:
Form
auxiliary verb + subject
If the auxiliary verb in the sentence is positive, the tag is negative
You are Spanish, aren't you?
If the auxiliary verb in the sentence is negative, the tag is positive
You're not Spanish, are you?
If there is no auxiliary verb in the sentence, we use do
You live in Spain, don't you?
functions & examples
We use tag questions:
1. to confirm information
This meal is horrible, isn't it
That film was fantastic, wasn't it
We are already sure of the answer, we just want confirmation, and we use a falling intonation with the tag question.
2. to check information:
You haven't got a piece of paper, have you?
You don't know where the boss is, do you?
The meeting's tomorrow at 9am, isn't it?
We do not know the answer, these are real questions, and we use a rising intonation with the tag question.
important points
1. In the present tense, if the subject is "I", the auxiliary changes to are or aren't
I'm sitting next to you, aren't I?
2. With let's, the tag question is shall we
Let's go to the beach, shall we?
3. With an imperative, the tag question is will you
Close the window, will you?
4. We use a positive tag question after a sentence containing a negative word such as never, hardly, nobody
Nobody lives in this house, do they?
You've never liked me, have you?
5. When the subject is nothing, we use it in the tag question
Nothing bad happened, did it?
6. When the subject is nobody, somebody, everybody, noone, someone, or everyone, we use they in the tag question
Nobody asked for me, did they?
7. If the main verb in the sentence is have (not an auxiliary verb), it is more common to use do in the question tag than have
You have a Ferrari, don't you?
8. With used to, we use didn't in the tag question
You used to work here, didn't you?
9. We can use positive question tags after positive sentences to express a reaction such as surprise or interest
You're moving to Brazil, are you?l