in short answerse.g. Yes, I do/ No, I don’t.

to avoid repeating the main verb/ verb phrase

e.g. Lucy loves Lady Gaga, but her boyfriend doesn’t (love Lady Gaga)

with so/ neither to say that something is the same

after a positive verbSo + auxiliary + subjecte.g. I like Simon.

So do I.

after a negative verbNeither + auxiliary + subjecte.g. I don’t like mushrooms.

Neither do I.

to show emphasis in a positive sentence. With the present/past simple, add do/does/did after the main verb.

With other auxiliaries to stress the auxiliary verb.

e. g. You didn’t close the door. I did it. I promise.

to make ‘echo questions’ to show interest

e. g. Do you like having a nap after dinner?

Do I ? I love it. to make question tags

to make question tags

Use a positive question tag with a negative verb and a negative question tag with a positive vrb

to ask another person to agree with you

e. g. It’s a nice hotel, isn’t it?

to check something you think is true e. g. Your mother is a nurse, isn’t she?