1) We have not seen her since the time she left the office
2) I have lived in this house about seven years, but I want to move
3) she has known the family for five years. They met in Kiev five years ago
4) He has learned German over two years, but then decided throw a study
5) I am working in this office since September (на счет этого я не очень поняла как образовать , тут есть указатель времени since , но нет формообразования "have"+3 форма гл. .Можно ещё так написать - I had worked in this office since September , но тут меняется смысл, получается что он работал , а в задании написано что он работает до сих пор , поэтому я хз)
6) если следовать примеру из учебника ,то His child has sicken for almost two weeks , но опять же правильнее His child was sick for almost two weeks.
7)I can talk to the director? -Sorry He went out. He has gone out a few minutes ago
8)My friend called me today? - No, she has not had called
9)This student does not know the answer, because he has not learned his lesson
10)Why you have not made the lessons?
11)This is the smartest a man whom I've ever met
12) I have not received any letters lately from him
13) I haven't heard about them since they left from Kiev
14) Today you have heard news on the radio?
15) He haven't read very much lately
16)can anyone give me a notebook? I have forgotten my home
17)How many times have you been to the movies this year?
18)I have just found out these people
19)We have been here since five o'clock
20) по примеру из учебника, изменяя форму глагола получается так -I have known , that he has not yet returned from the trip , но тут "знал" , а надо чтобы было "знаю" I have know that he has not yet returned from the trip (решай сам(а) как писать)