We use tags in spoken English but not in formal written English.
They are not really questions but are a way of asking the other person to make a comment and so keep the conversation open.
Making a tag is very mechanical. To make a tag, use the first auxiliary. If there is no auxiliary, use do, does or did. With a positive sentence, make a negative tag and with a negative sentence, make a positive tag.
- It's beautiful, isn't it?
- He has been, hasn't he?
- You can, can't you?
- It must be, mustn't it?
- You know him, don’t you?
- He finished it, didn't he?
- He will come, won't he?
- It isn't very good, is it?
- It hasn't rained, has it?
- It can't be, can it?
- Jenny doesn't know James, does she?
- They didn't leave, did they?
- He won’t do it, will he?
Notice these:
- There isn't an ATM here, is there?
- Let's have a cup of coffee, shall we?
To reply, use the same auxiliary:
- It's beautiful, isn't it? ~ Yes, it is. I think it's fabulous.
- It isn't very good, is it? ~ No, it isn't. In fact, it's terrible.
taken from http://www.englishgrammarsecrets.com/questionstags/menu.php
Hi, I'm Alejandro. I'm student of your saturday english course in SEFI.
ResponderEliminarI couldn't go the last Saturday. I'm wondering if you can tell me the topics of the class.
Thanks