11. He uses plastic bags to wrap food.
`=>` I suggest he should use a cloth bag to wrap food.
12. She always turns on the lights when going to bed.
`=>` I suggest she should turn off the light when going to bed.
13. His motorcycle uses too much gas.
`=>` I suggest his motorcycle shouldn't use too many gases.
14. They use electricity to catch fish
`=>` I suggest that they shouldn't use electricity to cath fish.
15. There are many cracks in your pipes
`=>` I suggest you should check your pipe.
16 I don’t want to watch TV for recreation
`=>` I suggest not watching TV for recreation.
17. They use many ordinary 100 watt light bulbs
`=>` I suggest they shouldn't use many ordinary 100 watts light bulbs.
18. He is having a toothache
`=>` I suggest that he should go to the dentist.
19. He wants to go to Australia for studying
`=>` I suggest that he shouldn't go to Australia for studying.
20. They use too much coal, gas, and oil.
`=>` I suggest they shouldn't use too much coal, gas, and oil.

Cấu trúc: 
S+ suggest+Ving
S+ suggest that+1 mệnh đề (S+V)
`=>` gợi ý ai đó làm gì.

11 I suggest he should use a cloth bag to wrap food.
12  I suggest she should turn off the light when going to bed.
13 I suggest his motorcycle shouldn't use too many gases.
14 I suggest that they shouldn't use electricity to cath fish.
15 I suggest you should check your pipe.
16 I suggest not watching TV for recreation.
17 I suggest they shouldn't use many ordinary 100 watts light bulbs.
18 I suggest that he should go to the dentist.
19 I suggest that he shouldn't go to Australia for studying.
20 I suggest they shouldn't use too much coal, gas, and oil.