Помогите пожалуйста. . .

№3
1)Theyve lived in the USA for six years.
2)Ive been at this schoo since I was 12.
3)The UK has been in the EU for a long time.
4)Maria hasnt felt well since yesterday.
5)Weve been here for an hour.
6)They havent been to Britain since 2005.

№4
1)Ive just started this exercise.
2)Weve studied this grammar already.
3)The teacher hasnt arrived yet.
4)The test has just started.
5)I havent finished this exercise yet.
6)Weve already had lunch.