Помогите пожалуйста!! Ничего не разумею

Example: Bob: It is dangerous to live here.Bob explained it was dangerous to live there.1) Diana: Jane is relaxing now. She is having a holiday on the coast.2) Frank: The population of the city is growing.3) Mrs Crawford: We have done a lot today.4) Steve: I kept a diary three years ago.5) Ms Evans: These medicines are well-known.6) Barbara: I bought a new badge yesterday.7) Mary: I worked at the factory last year.

помогите пж

Диалог A
1) I am
2) She is

Диалог B
3) he is
4) Is he
5) he is

Диалог C
6) They are
7) It is