1. I suggest using has instead of burning coal.

2. How about playing badminton?

3. Shall we buy energy-saving bulbs?

4. Why don't we use electricity economically?

5. I suggest you should ask her yourself.

6. I suggest our classroom should be decorated again.

7. I suggest a charity event should be organized to raise money.

8. What about using helmet to protect our heads?

9. I suggest a cultural festival should be organized to celebrate Lunar New Year.

10. What about collecting unused clothes for the victims?

11. The local authorities suggested garbage should be taken to recycle centers.

12. Andrew suggested going to the English speaking club.

13. They suggested that an advertisement should be put in this local newspaper.

14. Ba suggested Nam should repair the electric fan.

15. Tom suggested not telling anyone until we are certain that the report is true.

1. Shall we use gas instead of burning coal ?

→I suggest using has instead of burning coal.

2. Shall we play badminton ?

→How about playing badminton?

3. What about buying energy-saving bulbs ?

→Shall we buy energy-saving bulbs?

4. Let’s use electricity economically.

→Why don't we use electricity economically?

5.Why don’t you ask her yourself ?

→ I suggest you should ask her yourself.

6. I suggest decorating our classroom again.

→I suggest our classroom should be decorated again.

7. What about organizing a charity event to raise money ?

→I suggest a charity event should be organized to raise money.

8. I suggest that helmet should be used to protect our heads.

→What about using helmet to protect our heads?

9. Let’s organize a cultural festival to celebrate Lunar New Year.

→I suggest a cultural festival should be organized to celebrate Lunar New Year.

10. I suggest unused clothes should be collected for the victims.

→ What about collecting unused clothes for the victims?

11.“Why not take the garbage to recycling centers ?” said the local authorities.

→ The local authorities suggested garbage should be taken to recycle centers.

12. “Shall we go to the English speaking club ?” Andrew said.

→ Andrew suggested going to the English speaking club.

13. “Why don’t you put an advertisement in this local newspaper ?” they said to me.

→ They suggested that an advertisement should be put in this local newspaper.

14. “Why don’t you repair the electric fan, Nam” Ba asked.

→ Ba suggested Nam should repair the electric fan.