English does not have a future tense. We can use:be going to (Lesson 37)
Which one do you use?
I think I'll visit my uncle tomorrow.
I think I will take the exam next summer.
Just a minute and I'll get him for you.
I'm going to visit my uncle tomorrow.
"Did you hear that?" asked the teacher. "Tomorrow we're going to have a little test."
He is going to take the exam next summer.
I'm visiting my uncle tomorrow.
Your uncle knows this - perhaps he has made plans to welcome you.
The teacher says we're having a test tomorrow.
The teacher has made a plan - a student cannot change it.
He is taking the exam this summer.
He has entered his name for it and paid the exam fee.
NOTICE: Present continuous is a polite way to refuse an invitation because it shows that you cannot accept (not that you don't want to accept!).
I'm afraid I can't come tomorrow. I'm visiting my uncle.
What is your opinion about the future?
Do you think they'll win the game?
The world's population will likely reach 9.2 billion in 2050.
This time tomorrow, I'll be relaxing on the beach.
If they play like that for the whole game, they're going to lose.
It's cold! And look at the sky! I think it's going to snow.
We need 20 minutes to finish, but there's only 10 minutes left. We're not going to have time.
My plane leaves at six this evening.
This is the timetable.
The sun rises tomorrow at 6:32.
Because of the time of year.
The course begins next week.
I'll see him today.
This is an intention - you are deciding now.
I'll be seeing him today.
This is a prediction - and it is probably arranged.
NOTICE: The future is never certain. We often use the modal verbs could, may, might (Lessons 29-30) and also should (Lesson 33) to show how possible we think something is.