将下列句子变为被动语态.1、We·ll put on an English play in our school.

An English play will be put on by us in our school.
The flowers must be watered by us every day.
Knives are used for cutting things by them.
The farmers was made to work for a long time by him.
Was the window broken by him yesterday?
The light green dresses have been sold out by them.
The classroom is cleaned by us every day.
A hole can be digged in the earth by him.