Ответ:

Tania doesn't do her homework in her bedroom. (use "do" instead of "does" and add "do" before "her homework")

He finishes classes and goes to the gym after school. (use "finishes" instead of "finishs")

Our lessons start at half past eight. (use "start" instead of "starts")We have got biology on Thursdays. (use "have" instead of "has")

We ask the teacher when we don't understand. (use "ask" instead of "asks")

The girls don't go home at four o'clock. (use "don't" instead of "aren't" and remove "to")

He doesn't like history or art. (use "like" instead of "likes" and add "doesn't" before "like")

I don't go to dance classes at the weekend. (use "don't" instead of "doesn't" and add "to" before "dance classes")

My friend's dog has got lots of toys. (use "friend's" instead of "friends" and add apostrophe s 's after "friend" and use "has" instead of "have" because "dog" is singular)