Сделать упражнение 1 и 4 .

1 задание
1) for
2) since
3) since 
4) for 
5) since
6) since
7) for
8) for
9) since
10) since
11) for
12) since

4 задание
1) How long have you known Mike?
2) How long have you been a student?
3) How long has your brother been a student?
4) How long has Andrew had that dog?
5) How long have David and Elizabeth been together?