Помогите, не понела.

1.How long have you been in Africa?
2.I have been there for three years.
3.How long he live in Berlin?
4.He lived there since 2002.
5.How long does she wear that coat?
6.She wore it last winter.
7.Where have you been today?
8.I have been at the hospital.
9.How long the detective looked for the man?
10.He looked for him for two month.
11.Why did she take my money?
12.She traveled round the world for four years.
13.Where did you put my keys?
14.She moved to a new house in the country.
15.How long did your friend study German?
16.She studied German since 1999.
17.Did you ever play golf?
18.I already finished the documentary.
19 my teacher didn't explain that lesson yet
20.Kevin gave to his mother a nice present.
Я полагаюсь тебя устроит мой ответ и всё будет верно,если что-то будет ошибочно напиши мне.Я хочу знать свои оплошности.