Gerunds after Prepositions
In English grammar, there is an absolute and unbreakable rule concerning prepositions (e.g., in, on, at, about, of, for, with, without, before, after, by):
The Preposition Rule: If a verb immediately follows a preposition, it must be written in the gerund (-ing) form. It can never be an infinitive or a base verb.
1. Adjective + Preposition Combinations
Many English adjectives are paired with specific prepositions. Any action following them must be a gerund.
- Interested in: I am interested in learning photography. (Not: interested in to learn).
- Good / Bad at: She is very good at solving math puzzles.
- Excited about: They are excited about moving to a new city.
- Afraid of: He is afraid of flying in airplanes.
- Tired of: We are tired of waiting for the bus.
2. Verb + Preposition Combinations
Similarly, many verbs are followed by prepositions.
- Apologize for: I apologize for being late.
- Think about: She is thinking about changing her job.
- Succeed in: They succeeded in climbing the mountain.
- Dream of: He dreams of becoming an astronaut.
The “To” Preposition Trap: In phrases like look forward to or be used to, the word to is a preposition, not part of an infinitive. Therefore, it must be followed by a gerund.
- Correct: I am looking forward to meeting you.
- Incorrect: I am looking forward to meet you.
3. Prepositions of Method and Absence: “By” and “Without”
We frequently use by and without followed by a gerund to describe how an action is performed.
A. By + Gerund (Showing Method / How)
- You can improve your English by practicing every day.
- He turned off the television by pressing the main button.
B. Without + Gerund (Showing Absence of Action)
- He walked out of the room without saying a word.
- She solved the problem without using a calculator.
4. Summary Guide
| Combination Type | Pattern | Example |
|---|---|---|
| Adjective + Prep | good at + Verb-ing | He is good at drawing. |
| Verb + Prep | talk about + Verb-ing | They talked about starting a business. |
| ”To” as Preposition | look forward to + Verb-ing | I look forward to hearing from you. |
| Preposition of Method | by + Verb-ing | Learn by doing. |