Should be & must be

This lesson should be copied by the students.

Action should be taken for this.

The work should (must) be completed by Monday.

Flower should (must) not be plucked.

Coffee will be given there.

Food will be served at 10.

This game can be played by my son.

This ceiling can be touched by my sister.

Coffee could be  bought for ₹1.

Food ball could be played here.

Street corner could be seen from here.