Many people don't go to see the movie because of the expensive tickets

---> Because...........the stckets are expensive,many people don't go to see the movie........................................................

My sister and I are speaking Chinese now

---> Chinese ........is spoken by my sister and i now...............................................................

Peter has watched the play before

---> The play...........has been watched by peter before............................................................

They have gone out for a drink for thirty minutes

---> They started........going our for a drink for thirty minutes..............................................................