Correct the mistakes: When i was coming home my mother was cooking dinner

correct the mistakes;
1.when i was coming home,my mother was cooking dinner>>
2.  I had to stay at home last sunday, so had my sister>>
3.what did you do at 1 o'clock this afternoon>>
4.the visirors were looking for the monkeys>.
5. Don't let her to come into this room>>
6. Nam is going to plant trees in the garden now>>
7. they don't need some coffee>>
8.there is a armchair in the sitting room>>
9. Are Mr. and Mrs. Ford free on afternoon sonday>>
10.Is she work 8 hours a day and six dayx a week?>>