英语 句子改为被动语态

1 The environment's destroyed by some people.
2 The flowers aren't been watered by him everyday.
3 Are there many problems caused by a large population?
4 Their dormitory's cleaned (by them)everyday.

1. The environment is destroyed by some people.
2. The flowers are not watered by him everyday.
3. Do many problems caused by a large population?
4. There dormitory are cleaned by them everyday.

the evioronment is destroyed by some people.
the flowers are not watered by him every day.
are problems be caused by large population?
their dormitory can be cleaned everyday by them.

[1]The environment is destroyed by some people.
[2]The flowers aren't watered by him every day.
[3]Are many problems caused by a large population ?
[4]
Their dormitory is cleaned by them
every day.
方法换主语,调动be动词位置从而连接成句.

The environment was destroyde by some people
the flowers are not watered