Have a good time: will/did you?

[emsr2d2]

1. Have a good time, did you?
2. John be here tomorrow, will he?
3. Your mother at home, is she?

I find 2 and 3 very unnatural. I would accept 1 without "You had" at the beginning. However, #2 needs "John will" or "John'll". #3 needs "Your mother is" or "Your mother's".

 

[Raymott]

Have a good time, did you?
[...]
Even then, the first sounds awkward to me. :-(

It's not awkward to native speakers.
Your other question, about the future, doesn't seem to be answered. You can use a lot variants of these tags depending on the intonation.
"Have a good time tomorrow, won't you?" "Won't you" is the most common. "Will you" can be used, say in an encouraging or admonishing way - "And look, try to have a good time tomorrow, will you?"

 

[5jj]

Have a good time, did you?
John be here tomorrow, will he?
Your mother at home, is she?

Even then, the first sounds awkward to me. :-(

I find them perfectly normal in, as Swan notes, very informal speech.


John be here tomorrow, will he/won't he?
John coming tomorrow, is he/isn't he?
John going to come tomorrow, is he/isn't he?
John be coming tomorrow, will he/won't he?

I don't recommend that learners try to understand all the possible nuances of these, and I do recommend that learners do not try to use them all. However, learners do need to realise that they may very well hear constructions that are not covered in many course books.