Asking if some one remember or not

These are some expressions of:

Formal Expression:

-I wonder if you remember..... 
-You remember...., don’t you?
-You haven’t forgotten...., have you?
-Don’t you remember.....?
-You happen to remember it now?

Ways to respond:-
-Let me think, yes, I remember.
-I remember especially the scenery.
-I’ll never forget that-
-I’ll always remember.
-I can remember it clearly.

Informal expressions:-

Remember the old house we used to live in? 

Remember that?

I’m sorry I don’t remember

Ways to respond: 

-Hold on. Yes, got it! 

-I know.....

It’s coming back to me now.

Respond if you forget:-

-Sorry, I’ve completely forgotten.

-I’m afraid I forget.

-I really can’t remember.

-I’m afraid I have no memory of him.

-Errr, let me think. No, it’s gone.Sorry, it slipped off my mind.