“I enjoy to swim” sounds almost right - and that single wrong word is one of the most common grammar mistakes English learners make, at every level, in every native language background. The rule that governs it - which verbs take a gerund (swimming), which take an infinitive (to swim), and which take either with a different meaning - has no single logic to memorize by pattern alone. It has to be learned verb by verb. This guide breaks the whole system down: what gerunds and infinitives actually are, the verb groups that determine which one to use, the small set of verbs where the choice changes the meaning, and the mistakes that give away a non-native sentence even when every individual word is correct.
A gerund is the “-ing” form of a verb used as a noun: “swimming,” “reading,” “traveling.” An infinitive is “to” plus the base form of a verb: “to swim,” “to read,” “to travel.” Both forms can act as the subject or object of a sentence - “Swimming is fun” and “To swim is fun” are both grammatically valid English sentences with nearly the same meaning. The confusion isn’t about what gerunds and infinitives are; it’s about which one a specific verb, adjective, or preposition demands right after it, and that demand is not predictable from meaning or logic. It has to be learned as a property of each individual verb.
English verbs fall into three groups when something follows them: verbs that only take a gerund, verbs that only take an infinitive, and verbs that take both - sometimes with the same meaning, sometimes with a completely different one. There is a weak historical pattern behind this (older, more established verbs often take the infinitive; verbs describing ongoing or repeated actions often take the gerund), but it is too unreliable to use as a working rule. Native speakers don’t consciously apply a rule at all - they’ve simply heard “enjoy swimming” and “want to swim” thousands of times each and internalized the pairing. Learners have to build that same internalized list deliberately, through exposure and memorization, rather than by deriving it from grammar logic.
One reliable shortcut does exist: prepositions are always followed by a gerund, never an infinitive. “I’m interested in learning Spanish,” not “interested in to learn Spanish.” “She’s good at cooking,” not “good at to cook.” Whenever a preposition comes right before a verb, that verb must take the “-ing” form - this single rule resolves a large share of gerund/infinitive confusion on its own.
“I stopped smoking” means the smoking itself ended - the gerund describes the activity that was discontinued. “I stopped to smoke” means something else entirely: a different activity paused so that smoking could begin - the infinitive here expresses purpose (“stopped in order to smoke”). This is the single most consequential gerund/infinitive mix-up in the language, since the two versions describe nearly opposite real-world events.
“I remember locking the door” describes a memory of a past action - the locking already happened, and it is being recalled. “I remembered to lock the door” describes a task that was successfully not forgotten - the locking happens as a result of the remembering, not before it. The gerund looks backward at a completed event; the infinitive looks forward to a duty that got done.
“Try restarting the computer” suggests an experiment - one possible solution among several, worth attempting to see if it helps. “Try to restart the computer” suggests genuine difficulty or effort - an attempt that might fail. The gerund version is casual troubleshooting language; the infinitive version implies the action itself is hard to accomplish.
Gerunds and infinitives are a grammar rule you internalize by hearing correct sentences over and over, in real spoken rhythm - not by memorizing a chart. The Pronounce Checker tool lets you speak full example sentences like “I’m looking forward to hearing from you” or “She stopped to answer the phone” out loud and get instant feedback on how natural and accurate your delivery sounds. Saying the correct pattern out loud, repeatedly, in context, builds exactly the kind of automatic recall that native speakers rely on - far more effectively than reading a rule silently ever can.
“I’m interested in to learn English” is one of the most frequent errors across every language background, because many languages use their equivalent of “to” directly after a preposition without any restriction. In English, a preposition is always followed by a gerund: “interested in learning,” “good at cooking,” “tired of waiting.” This single rule alone eliminates a large share of gerund/infinitive mistakes once it is internalized. Our guide on common English collocations covers many more of these fixed preposition-plus-verb patterns worth memorizing as whole chunks.
Learners often assume that if one common verb of intention or feeling (“want,” “hope,” “decide”) takes the infinitive, similar-feeling verbs must too. But “enjoy,” “suggest,” “avoid,” “consider,” and “mind” are strictly gerund-only, with no exceptions: “I enjoy swimming,” never “I enjoy to swim.” There is no shortcut here - this group simply has to be memorized as its own closed set, separate from the verbs of intention that take the infinitive.
Because both forms are grammatically correct after these verbs, learners often pick whichever one feels more natural without realizing the sentence’s meaning actually changes. Our guide on the most common phrasal verbs in English covers several other cases where a small structural choice quietly changes what a sentence communicates - the same principle at work here. Double-checking meaning, not just grammatical correctness, is essential with this specific group of verbs.
A gerund is the “-ing” form of a verb used as a noun (“swimming”), while an infinitive is “to” plus the base verb (“to swim”). Both can function as the subject or object of a sentence, but specific verbs, adjectives, and prepositions determine which form must follow them.
There is no single reliable grammar rule - it has to be learned verb by verb through exposure and memorization. The one dependable shortcut is that any verb directly following a preposition always takes the gerund form, with no exceptions.
Yes. Verbs like “start,” “begin,” “like,” and “love” can take either form with essentially the same meaning. A smaller group - “stop,” “remember,” “try,” “forget,” and “regret” - can take either form too, but the meaning genuinely changes depending on which one is used.
Historically, the infinitive form came from Old English verb patterns, while the gerund developed later from noun-forming suffixes attached to verbs. The two systems never fully merged, leaving modern English with two competing structures that each verb inherited somewhat arbitrarily from its own history.
No. “Enjoy” is strictly a gerund-only verb in every context and register of English - the correct form is always “I enjoy swimming.” This is one of the more rigid rules in the gerund/infinitive system, with no accepted exceptions in standard English.
Group verbs into short lists by category (gerund-only, infinitive-only, meaning-changing) and practice full example sentences out loud rather than the verbs in isolation - hearing and speaking the correct pattern in context builds recall far faster than memorizing an abstract chart.
Gerunds and infinitives are one of those grammar points that feels arbitrary until you’ve absorbed enough real examples for the correct pattern to start sounding right on its own - the same way it does for native speakers. Start with the reliable rules (prepositions always take the gerund), memorize the meaning-changing group deliberately, and build the rest through exposure. Try speaking today’s example sentences out loud using the Pronounce Checker tool to start training your ear for the pattern, one correct sentence at a time.
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