Logical: Last weekend

Four teenagers are back at school on Monday morning. They tell each other what they did and what they didn't do at the weekend. Read and find out:

Who cooked Chinese food on Sunday? Who didn't go to bed early on Saturday?

???1st chair2nd chair3rd chair4th chair
Saturday +
Saturday -
Sunday +
Sunday -
name

1) Sam didn't meet his girlfriend on Sunday.
2) The teenager who went shopping on Saturday is sitting next to the person who didn't surf the net on the same day.
3) Nora is sitting on the first chair.
4) The boy who is sitting between two girls watched TV last Saturday.
5) One person didn't go out on Sunday and enjoyed a good book.
6) Mona is sitting between two boys.
7) The girl who visited her friend on Saturday came home early from the cinema on Sunday.
8) Tim wrote an important e-mail on Saturday.
9) The girl next to the boy who didn't ask for help on Sunday didn't feel good on the same day.
10) One person didn't play football on Saturday and worked for school on Sunday.
11) It wasn't Mona who didn't call her friend last Saturday.