The rule as a picture, 5 multiple-choice questions, 3 sentences to correct and a short writing task. Free to print and copy for your class or for self-study.
Want the explanation first? Read the Will vs Going to lesson
Use will for decisions made as you speak, predictions based on opinion, offers and promises: I'll help you. Use going to for plans made before speaking and predictions based on what you can see now: I'm going to study medicine. Look at those clouds: it's going to rain.
Maybe I'll go to Greece.
I'm going to go to Greece. I've booked it.
Write two sentences about your own life: one with Will and one with Going to. Then explain the difference to a partner.
Answers will vary. Check that each sentence follows the rule on page 1, or paste them into Clarigram to have them checked.