1a) Dave thinks aliens will visit our planet in the next twenty years.
1b) They are going to visit their aunt and uncle on Sunday.
2a) It's raining. I will drive you to Jenny's house if you like.
2b) In the holidays my sister is going to drive around Ireland with some friends.
3a) I won't forget your birthday next year. I promise!
3b) Jill's always in a hurry. She is going to forget her geography homework again.
4a) You're wearing new shoes. You are going to have terrible blisters tomorrow.
4b) 'Do you want chips or salad?' 'I will have chips, please.'