Grammar / B1 Grammar lessons and exercises / Gerund or infinitive: Do, to do, doing

After certain verbs, adjectives, or prepositions, we use either a gerund (-ing form) or an infinitive (to + verb). Sometimes both are possible — but the meaning changes!
These verbs are usually followed by a gerund:
These verbs are usually followed by an infinitive:
With these verbs, the choice between gerund and infinitive changes the meaning completely.
After any preposition (in, at, on, about, for, of, etc.), use a gerund:
❌ Never: "afraid of to fly" → Incorrect!
📌 Quick Summary:
🔵 Gerund (-ing): after enjoy, avoid, prepositions, expressions
🟢 Infinitive (to + verb): after want, decide, hope, promise
🟠 Meaning changes with: remember, forget, stop, try
⚠️ After prepositions → always gerund!