Correct the mistakes in the following senteces:
1)He studys Englishat our courses.
2)We are siting in the classroom now.
3)In Moday we have 5 lessons.
4)When your mother comes home?
5)This task is easyer than that one.
6)Peter doesn't knows my brother.
7)Where do they playing now?
8)there is many pupils is our class.
9)She is a very serios person.