The exercises were too long for the children to do in an hour.
-> The exercises were so long that the children couln't do in an hour.
How about collecting and reusing these bottles and cans?
-> I suggest collecting and reusing these bottles and cans.
Why dont we clean the school yard every Sunday morning?
-> I suggest the school  yard should be cleaned every Sunday morning
Why dont we keep the school yard clean?
-> I suggest that the schoolyard should be kept clean.
Why dont we use energy-saving appliances instead of ordinary one to save energy?
-> I suggest using energy-saving appliances instead of ordinary one to save energy
The river is too dirty for us to swim in
-> Since the river is too dirty, we can't swim in.
Jeans are always in fashion, so young people still want to wear it
-> Because Jeans are always in fashion,  young people still want to wear it
Hoa stayed at home because it rained heavily
-> It rained heavily so Hoa stayed at home
You should reduce the volume at night
-> You should turn down the volume at night.
Let help elderly people and war invalids with their chores
-> How about helping elderly people__________
She is responsible for looking after her little sister
-> Looking  after her little sister is Hoa's responsibility
Why dont we clear up all the trash on the ground before leaving?
-> I suggest clearing up......
Why dont we collect unused clothes to help poor children?
-> I suggest that unused clothes should be collected to help poor children.

5 sao + cam on ha . mk buon ngu lam r