Grammar / B1 Grammar lessons and exercises \ Future forms: Will, be going to, present continuous

For general predictions or beliefs about the future:
When there’s visible evidence or it’s about to happen:
Decided at the moment of speaking:
Decided before speaking:
Use present continuous for fixed plans (include time/place):
You can also use be going to for arrangements:
Use present simple after time conjunctions — NOT future forms:
❌ I’ll retire when I’ll be 70.
✅ I’ll retire when I’m 70.
❌ I won’t call you until I will arrive.
✅ I won’t call you until I arrive.
Use may or might when you’re not sure something will happen:
💡 Compare:
I’ll be late. (= I’m sure.)
I might be late. (= It’s possible, but not certain.)
I’m going to Denmark. (= Planned.)
I might go to Denmark. (= Maybe, if things work out.)
📌 Remember:
Will = predictions, instant decisions, promises, offers, requests
Be going to = evidence-based predictions, prior plans
Present Continuous = fixed arrangements (with time/place)
⚠️ After when, before, after, until, as soon as → use present simple
🔁 May/Might = uncertain future possibilities