Помогите пожалуйста,не могу разъяснить выбор..Упражнение 6. Complete the conversation. Use 039;m

Помогите пожалуйста,не могу разъяснить выбор..Упражнение 6. Complete the conversation. Use 'm going to, 're going to, ll or won't.Растолкуйте выбор(!!!!)Непременно.

A: (1) I ___________ play tennis this afternoon.

В: Great! (2) I ___________ come with you.

A: But you haven't got a tennis racket.

В: (3) I ___________ borrow my brother's racket.

A: And you don't know how to play tennis.

В: (4) I ___________ practise first.

A: But (5) I ___________ play with Phil and after the match (6) we ___________ have lunch with his parents.

В: Oh! Well, then (7) I ___________ come with you. (8) I ___________ do my homework.