BBC ESL

Today, I studied Agreement with auxiliaries. We have to think signal agreement Yes/No, pronounce, and auxiliary. I answered this

We should try to get 8 hours' sleep every night.
-Yes, we should.
Those oranges weren't very good.
-No, they weren't.
This won't take too long.
-No, it won't
I've always been good at cooking.
-Yes, you've. (X)
-Yes, you have. (O)
Because we don't usually use short forms in short answer.

I feel  BBC ESL Quizes as a game..not study. It is fun more than I think.