b) It’s time :
1. You have to dress yourself now.
-> It’s time you dressed yourself.
2. I think the children should go to bed.
-> It’s about time the children went to bed.
3. Hurry up or we will be late for the train.
-> It’s time we were late for the train.
4. It’s time for children to go to bed.
-> It’s high time the children went to bed.
5. It’s twelve o’clock. Let’s go home !
-> It’s about time we went home.