会英语的请帮忙改几个被动语态

题目

会英语的请帮忙改几个被动语态
1、We planted many trees in our school garden.
2、We clean our classroom twice a day.
3、We must keep the noise under 50 dbs here.
4、They teach English in our school.
5、They will build a new bridge over the river.
6、They bought me a new pencil-box.
7、People take care of trees here.
8、We don't play football every day.
9、Our teacher often helps us when we are in trouble.
10、Didn't they tell you about it?

答案

1.Many trees were planted by us in our school garden.2.Our classroom is cleaned by us twice a day.3.The noise must be kept by us under 50 dbs here.4.English is taught by them in our school.5.A new bri...