In English grammar, a preposition + gerund structure occurs when a preposition is followed by a gerund (the -ing form of a verb used as a noun).
1. The Rule
After any preposition, you must use a gerund, not the base form or infinitive.
❌ Incorrect: I’m interested in learn English.
✅ Correct: I’m interested in learning English.
2. Structure
Preposition + Gerund (-ing form)
Here, the gerund acts like a noun, serving as the object of the preposition.
3. Examples
a) After phrasal verbs
He gave up smoking.
She’s looking forward to meeting you.
b) After adjective + preposition
They are good at playing chess.
I’m tired of waiting for the bus.
c) After noun + preposition
There’s no point in arguing.
I have an interest in reading history books.
d) After common prepositions
Thank you for helping me.
She left without saying goodbye.
Before leaving, lock the door.
4. Common Prepositions that Take Gerunds
Preposition Example Sentence
about We talked about going to Italy.
of She’s capable of running a business.
in He believes in working hard.
for This tool is used for cutting wood.
on He insisted on paying for dinner.
at She’s good at drawing portraits.
without He left without saying a word.
by You can improve by practicing daily.
5. Exceptions
“To” can be tricky — in preposition + gerund form (like look forward to), “to” is a preposition, so it’s followed by a gerund. But in an infinitive (want to go), “to” is part of the verb.
✅ I look forward to seeing you. (preposition + gerund)
✅ I want to see you. (infinitive)
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