Grammar mistakes exercise

Below is a list of typical grammar mistakes. Correct them:­
1 I would like that my mother was here. ...........................................................................
2 I asked to the doctor a question. ...........................................................................
3 We're going out together for 10 years. ...........................................................................
4 His parents want that he study economics. ...........................................................................
5 She must to be a great tennis player. ...........................................................................
6 It's for that I'm not going to the party. ...........................................................................
7 It was the house of my aunt. ...........................................................................
8 I saw Sue before to come here. ...........................................................................
9 We were 16 people in the group. ...........................................................................
10. I don't use to have breakfast so early.......................................
11. How long have your boss been away? ...........................................................................
12.I don’t go to that new shop yet. ..........................................................................
13. We are 12 people in my tai chi class. ...........................................................................
14.Why wasn’t you there? ...........................................................................
15. Teachers doesn’t have short holidays. ...........................................................................
16. I haven’t seen he yet. ...........................................................................
17.There is a million people in Valencia. ...........................................................................
18How many friends does he has? ...........................................................................
19.My mother doesn’t like cook. ...........................................................................
20.I chose the more expensive thing on the menu. ...........................................................................