把下列的句子改为被动语态
1.They speak English in the United States.
2.Did he break the window yesterday.
3.Someone watered the flowers just now.
4.We put off sports meeting because of the rain.
5.He finished the work just now.
6.They planted more trees last month.
7,We saw a lot of beautiful flowers there.
8.He gave me a book yesterday.
9.He bought me a gift last week.
10,We often see him help others.