Your room should be cleaned by you on weekends.
问题补充:
your room ( should ) ( be ) cleaned on weekends
2.more and more chinese peple speak english 同上
english ( is ) ( spoken ) by more and more chinese peple.
3.can you tell me how i can become a volunteer改为同义句
Can you tell me how to become a volunteer?
4.没有机会用英语怎么说
Have no chance.
希望能帮到你,祝更上一层楼O(∩_∩)O
有不会的欢迎再继续问我(*^__^*)