11. I suggest that you should go to school on time.(Why).
=> why don't we go to school on time?
12. Why don't you install a panel on the roof of your house? (suggest).
=> I suggest installing a panel on the roof of your house
13. Why don't we take a bus to the city?. (about)
=> What about taking a bus to the city?
14. What about meeting at the school gate? (Let's).
=> Let's meet at the school gate
15. Go to school now or you will be late for the exam. (If)
=> If you don't go to school now, you will be late for he exam
16. Why don't we raise money for poor students.(suggest that).
=> I  suggest that we should raise money for poor students