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Gerunds & Infinitives

Know when to use to do and when to use doing, including verbs that change meaning.

Gerunds and Infinitives as Nouns and Complements

Gerunds and infinitives often function as noun forms, but advanced usage depends on the grammar pattern required by the main word. A gerund can act as a subject or object: "Swimming improves endurance" and "She enjoys reading." An infinitive can also function as a subject or complement, especially in formal or abstract statements: "To forgive is not always easy." In real usage, gerunds are more common as subjects when talking about general activities, while infinitives often sound more deliberate, evaluative, or formal. The choice after a verb, adjective, or noun is frequently lexical and must be learned accurately. • Verbs of enjoyment, avoidance, completion, and suggestion often take gerunds: enjoy, avoid, finish, consider, recommend. • Verbs of intention, decision, desire, and expectation often take infinitives: want, decide, hope, plan, refuse, manage. • Some verbs can take both forms with little or no change in meaning, especially start, begin, like, continue, and prefer in certain contexts. • Other verbs change meaning depending on whether they are followed by a gerund or infinitive, such as remember, forget, stop, try, and regret. At advanced level, the challenge is not just identifying a pattern, but understanding whether the verb, adjective, or noun selects a gerund or an infinitive, and whether the meaning changes when both are possible.

Examples

• Swimming is good exercise. (gerund as subject) • To swim across that river would be dangerous. (infinitive as formal subject) • She avoided answering the question. (verb + gerund) • He decided to answer immediately. (verb + infinitive) • I stopped smoking five years ago. (quit the activity) • I stopped to smoke a cigarette. (paused another action)

Tips

Remember: gerund often sounds like the activity itself, while infinitive often sounds like a decision, goal, or intention. Learn verbs in patterns, not in isolation: memorize the verb plus the form that follows it.

Advanced Problem Cases: Bare Infinitive, Causatives, and Split Infinitives

Some advanced structures depend on a bare infinitive, which is the base verb form without to. This appears after modal verbs such as can, must, should, may, and might, and after causative or perception patterns such as make, let, see, hear, and watch in many standard forms: "They made him apologize," "We let her leave," "I saw him cross the street." With make and let, the infinitive is bare, not full, in most active structures. Advanced learners also need to distinguish sentence patterns involving gerund phrases after prepositions from structures where the infinitive is required after an adjective or noun. For example, "She is capable of solving the problem" uses a preposition plus gerund, while "She is eager to solve the problem" uses adjective plus infinitive. Split infinitives are formed when an adverb appears between to and the base verb, as in "to carefully explain." Traditional grammar often discouraged them, but modern English accepts them when they improve clarity or rhythm. In formal writing, split infinitives should be used thoughtfully rather than avoided blindly. • Bare infinitives follow modals and certain causative/perception verbs. • Gerunds commonly follow prepositions, even in complex noun phrases. • Split infinitives are a style choice, not a grammar error in modern English. At advanced level, success means choosing the form that matches both grammar and nuance, while avoiding overgeneralization from a single rule.

Examples

• You must finish the report today. (modal + bare infinitive) • They let us use the room. (let + bare infinitive) • She heard him sing in the hall. (perception verb + bare infinitive) • He is capable of leading the team. (preposition + gerund) • They decided to quietly leave the meeting. (split infinitive for clarity) • She was made to apologize publicly. (passive causative + full infinitive)

Tips

After a modal, use the base verb form, not to plus verb. Do not fear split infinitives when they make the sentence clearer; clarity matters more than outdated rules.

Gerunds as subjects, objects, and after prepositions

A gerund is the -ing form of a verb used as a noun. It can act as the subject of a sentence, the object of certain verbs, or the object of a preposition. • As a subject, a gerund talks about an activity in a general way: "Swimming is good exercise." This sounds natural when the action itself is the topic. • As an object, a gerund often follows verbs such as enjoy, avoid, finish, and suggest: "She enjoys reading." These verbs are commonly followed by -ing forms. • After prepositions, use a gerund, not an infinitive: "He left without saying goodbye." This is a very common rule in English. A useful pattern is to look for a preposition before the verb. If you see words like in, on, at, without, after, before, or about, the following verb is usually a gerund. This helps avoid mistakes such as "good at to draw" or "interested in learn." Remember that gerunds can also follow fixed expressions like "look forward to" or "be used to," because the to in these expressions is a preposition, not part of an infinitive.

Examples

• Swimming helps me relax. (gerund as subject) • I enjoy cooking at home. (verb + gerund) • She left without paying the bill. (after preposition) • We are interested in learning Spanish. (after preposition) • He is used to getting up early. (fixed expression with gerund) • They talked about moving to Canada. (object of preposition)

Tips

Tip: If a verb comes after a preposition, use -ing. Tip: Ask yourself whether the word is acting like a noun; if yes, a gerund may be the right choice.

Infinitives with to, bare infinitives, and verb patterns

An infinitive is the base form of a verb with to: to study, to travel, to help. Many common verbs are followed by an infinitive, especially verbs of intention, decision, and desire such as want, decide, hope, plan, and learn. • Use a full infinitive after many verbs: "We decided to stay." "I hope to see you soon." • Use a bare infinitive, without to, after modal verbs such as can, must, should, may, and might: "You must finish now." The modal carries the grammar, so to is not used. • After make and let, use the bare infinitive: "My parents let me drive." "The movie made me cry." Some verbs can be followed by either a gerund or an infinitive with no important change in meaning, especially start and like in many contexts: "I started studying" and "I started to study" both sound acceptable. However, style and focus can change slightly. Also learn the pattern infinitive of purpose: "I went to the store to buy milk." Here, the second infinitive explains why the action happened.

Examples

• She wants to improve her English. (verb + infinitive) • We hope to visit next summer. (verb + infinitive) • You should call her now. (modal + bare infinitive) • My teacher let me leave early. (make/let + bare infinitive) • He started to laugh. (both forms possible) • I study every day to pass the exam. (infinitive of purpose)

Tips

Tip: After a modal, never use to. Tip: If a verb expresses purpose, answer the question

Meaning changes, adjective plus infinitive, perfect and passive forms, and split infinitives

Some verbs can take both a gerund and an infinitive, but the meaning changes. This is one of the trickiest parts of the topic. • stop + gerund means to quit an action: "He stopped smoking." stop + infinitive means to pause for another action: "He stopped to smoke." • remember and forget change depending on whether the action happened before or after the remembering or forgetting: "I remembered locking the door" versus "Remember to lock the door." • try can mean experiment with something when followed by a gerund, or make an effort when followed by an infinitive: "Try adding salt" and "Try to add salt." • regret + gerund refers to a past action; regret + infinitive is often used for bad news or formal announcements. Adjectives are often followed by infinitives: "I am happy to help." This pattern is common after words like ready, glad, sad, surprised, and afraid. Perfect and passive forms add more detail. Perfect gerund and infinitive forms show an earlier action: "She is proud of having won" and "He seems to have forgotten." Passive forms show the action done to the subject: "The room needs to be cleaned." Finally, split infinitives happen when a word comes between to and the verb, as in "to quickly finish." This is usually acceptable in modern English, especially for clarity.

Examples

• He stopped smoking last year. (quit the habit) • He stopped to answer the phone. (paused for a purpose) • I am happy to help. (adjective + infinitive) • She seems to have left already. (perfect infinitive) • The documents need to be signed. (passive infinitive) • We decided to really focus today. (split infinitive, acceptable)

Tips

Tip: For stop, remember, forget, try, and regret, check whether the meaning is about an earlier action or a later one. Tip: Split infinitives are usually okay, but avoid them if they sound awkward.

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