He likes apples very much.
-Does he like apples?
-Who likes apples?
-What does he like?
-He likes apples very much,doesn't he?
I ate porridge yesterday.
-Did you eat porridge yesterday?
-What did you eat yesterday?
-Did you eat porridge or soup yesterday?
-Who ate porridge yesterday?
They are skating now.
-Are they skating now?
-What are they doing now?
-Are they skating or reading now?
-They are skating now,aren't they?