把下列句子变成复数句1、this is a bike 2.thatis her book3.that is an era

1、These are bikes.
2.Those are her books.
3.Those are erasers.
4.They are red oranges.
5.They are teachers.
6.what's these?
7.These are Chinese boys
.8.These are our mothers.
9.We are students
.10 .The photos are on the wall.
11.They are action movies.