A tag question is a special construction in English. It is a statement followed by a mini-question. We use tag questions to ask for confirmation. They mean something like: "Is that right?" or "Do you agree?" They are very common in English.

1. Good morning!
Today is a great day, isn’t it?

2. Tag
Questions
Positive and negative form
Review

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Tag questions turn a statement into a question. They are often used for
checking information that we think we know is true.
Tag questions are made using an auxiliary verb
(example:be or have) and a subject pronoun (example:I,you,she).
Negative question tags are usually contracted: It’s warm today, isn’t it?
If the main clause has an auxiliary verb in it, you use the same verb in
the tag question. If there is no auxiliary verb (in the present simple and
past simple) use do/does/did.
Attention: the question tag after I am is aren’t I.
Ex: I’m in charge of the food, aren’t I?

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Exercise
1. You work in a bank, __________________
1. They play football on Sundays, _____________
1. The bus isn’t coming, ________________
1. She’ll be cooking all day, _________________
1. Julie didn’t eat all the cake, _______________
1. Max has been studying a lot recently, ____________
1. You haven’t been sleeping, _____________