Відповідь:

1.

a. Are you late? I will drive you to the bus stop if you want. ( решение спонтанное)

b.Nex summer my cousin is going to drive across America with his girlfriend.

2.

a. We are going to visit my grandparents this weekend.

b. I think astronauts will visit  other planets in next twenty years.

3.

a. "Tea or coffee?" " I will have coffee, please"

b. Yiu have been in the sun for hours. You are going to have terrible..

4.

a. I will not forget your birthday again this year. (Обещания передаются при помощи will)

b. Dad's so busy. He is going to forget his and Mum's wedding..