When having an informal conversation, it is important to make sure you keep it open so that your listener can take part in it. For that, we use QUESTION TAGS :
The basic structure is:
Question tags are formed by the auxiliary or modal verb + subject from the main statement.
|You can’t ski, can you?|
|You have to go, don’t you?|
|I have been working hard, haven’t I?|
There are some special cases you must be careful with:
|I am right, aren’t I?|
|Nothing came in the post, did it?|
|Let’s go, shall we?|
|Don’t open the door, will you?|
|Be quiet, will/won’t you?|
The different intonation when using a question tag shows how sure you are about the information you are giving:
|You haven’t met Mary,||have you?||/ rising||Real question.I’m not sure|
|It’s a beautiful day,||isn’t it?||\ falling||not a real questionI’m sure|
If in doubt, here you are some exercises online for you to practice.