1) The teacher explained this rule twice
This rule was explained
twice by the teacher
2) they
do not grow fruit in this part of this country
in this
part of this country isn’t grown fruit
3) they
have designed new scenery for the party
new
scenery for the party has been designed
by them
4) they
laughed at her because of her hat
she was
laughed by them because of her hat
5) we
have already sent for the doctor
the
doctor has been already sent for