Infinitives vs. Gerunds: The Rules Explained Simply

The rules for verb complements

The rules for infinitives and gerunds come down to which form each verb accepts as its complement. Some verbs take only a gerund, some take only an infinitive, and some accept both, either with the same meaning or with a different one. The rules are mostly a matter of verb-specific patterns.

Beyond individual verbs, a few general tendencies help. Gerunds often behave like nouns and fit where an activity does, while infinitives often point to purpose or a goal. These tendencies explain many of the patterns you will encounter.

Core rules by verb group

Rules worth memorizing

• always use a gerund after a preposition, never an infinitive
• use a gerund when the verb is the subject of the sentence
• use an infinitive to express purpose, as in I went to study
• learn the fixed patterns for high-frequency verbs like enjoy, finish, decide, and want

Apply the rules in your writing

1. 1
   Identify the main verb

   Find the verb whose complement you are choosing.

2. 2
   Apply the general rules

   Use a gerund after prepositions and as a subject; use an infinitive for purpose.

3. 3
   Recall specific patterns

   For other verbs, use the form that verb requires.

4. 4
   Check meaning-changing verbs

   Confirm the form matches what you intend for verbs like stop and remember.

Rules that build confidence

These rules build confidence because they reduce a confusing topic to a few patterns. The general rules cover many cases, and memorizing a short list of verbs fills the gaps. With practice, the correct form starts to come automatically.

For a reliable check, run your draft through a grammar tool. The free Grammar Checker at AI Humanizer Lab flags infinitive and gerund errors with no word limits, helping you keep verb complements consistent across longer texts.

Forms that flow from practice

The infinitive-versus-gerund choice flows from practice more than from logic. Once you have seen enjoy followed by a gerund a dozen times, the wrong form starts to feel jarring. Exposure is the real teacher, so read widely and notice which form each common verb takes.

A practical shortcut is to keep a short personal list of verbs that trip you up, with their required form beside each. Review the list before you write, and the forms stick faster than any abstract rule. Within a few weeks, the most common verbs stop causing trouble.

High-frequency verbs to master

• enjoy, avoid, finish, and suggest, which take gerunds
• decide, want, hope, and agree, which take infinitives
• stop and remember, which change meaning with the form
• any verb that follows a preposition, which always takes a gerund

Forms that become automatic

Verb forms become automatic through exposure and a little focused practice. The more correct English you read, the more your instincts align with native patterns, and the less you rely on rules you have to look up. Over a few weeks, the most common verbs stop causing hesitation.

Keep a personal list of verbs that trip you up, and review it before you write. That small effort pays off quickly, because the same high-frequency verbs appear in almost everything you write. Mastering them removes a steady source of error and lets your attention return to your ideas.