I often see him play football after school.(改为被动语态)
He is often play football after school.
Cathy and Linda ( not be) back to their hometown for two years.
There are some boys (swim) in the river now. It's very dangerous.
The (careful) you work, the fewer mistakes you'll make.
Chinese parents try their best (提供)a good environment for their children.
A Chinese father made some nice dresses for his daughter with his (wife) old shirts.