Question 1

Why do prepositions always take gerunds?

Accepted Answer

Prepositions need a noun or noun-like element after them. You can say "interested in music" (noun) or "interested in learning" (gerund acting as a noun). You cannot say "interested in to learn" because an infinitive cannot follow a preposition in this way. Gerunds function as nouns in English grammar, which is why they fit perfectly after prepositions. This rule has no exceptions — whenever you see a preposition, the verb that follows must be in the -ing form. Learning common adjective + preposition and verb + preposition combinations with their gerunds will help you use them naturally.

Question 2

What are the most common adjective + preposition + gerund combinations?

Accepted Answer

The most frequently used combinations include: "interested in doing," "good/bad at doing," "tired of doing," "afraid of doing," "excited about doing," "sorry for doing," "worried about doing," "keen on doing," "responsible for doing," and "capable of doing." Each adjective has a fixed preposition — you cannot change them. Learners often make mistakes like "interested about" (wrong) instead of "interested in" (correct), or "good in" (wrong) instead of "good at" (correct). Learning these as complete phrases ("interested in doing") rather than separate words helps you avoid preposition errors.

Question 3

What is the most common mistake learners make with preposition + gerund?

Accepted Answer

The most common mistake is using an infinitive instead of a gerund after a preposition: "interested in to learn" instead of "interested in learning," or "good at to cook" instead of "good at cooking." This error occurs because learners associate "to" with infinitives and extend that logic to all prepositions. The fix is simple: after any preposition (in, at, of, about, for, on, with, without, by, before, after), the verb must be in -ing form. No exceptions. Another frequent error is using the wrong preposition: "interested about" instead of "interested in," or "good in" instead of "good at." Learn preposition + gerund combinations as complete fixed phrases.

Gerunds and Infinitives: Preposition + Gerund

Quick Rule

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Gerunds and Infinitives Error Correction

Common Gerund and Infinitive Verbs

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-ed vs -ing Adjectives

Conditionals

Present Perfect