- a. I am busy organizing an exhibition for our class.
b. Last week we were busy preparing for our field day.
- a. We used to think how nice and clean our school lunch was on plastic plates and trays.
b. There used to be a dress shop at this corner of the street.
- a. It is time for us to do something.
b. Isn’t it time for you to go to bed, Jimmy?
- a. Used plastic things will be turned into flowerpots.
b. They turned the novel into a movie.