In English grammar, verbs are categorized into finite and non-finite forms. Finite verbs change according to tense, person, and number (e.g., “runs,” “ran”). Non-finite verbs, however, do not inflect for these grammatical categories. They include infinitives, gerunds, and participles. Understanding non-finite verbs is essential for mastering sentence structure and advanced English usage.
What Are Non-Finite Verbs?
Non-finite verbs are verb forms that are not conjugated to agree with a subject in terms of tense or person. They can function as nouns, adjectives, or adverbs, and are often used in complex sentences. Because they carry no tense marking, non-finite verbs help create subordinate clauses that compactly express time, purpose, cause, or manner without a full second clause.
Types of Non-Finite Verbs
1. Infinitive
The infinitive is the base form of a verb. It appears in two forms:
- Full infinitive: preceded by “to” (e.g., “to run,” “to eat”).
- Bare infinitive: without “to” (e.g., “I can run,” “She made him cry”).
Infinitive as Subject: “To learn a new language takes time.” The infinitive phrase acts as the subject of the sentence. Using a gerund is more common in everyday speech (“Learning a new language takes time”), but the infinitive is perfectly grammatical.
Infinitive as Object: “She wants to leave early.” The infinitive follows a finite verb as its direct object.
Infinitive as Subject Complement: “His goal is to win the championship.” The infinitive renames or describes the subject after a linking verb.
Infinitive as Adjective Modifier: “I need a tool to fix the pipe.” The infinitive modifies a noun, explaining its purpose.
Infinitive as Adverb of Purpose: “He called to apologize.” The infinitive explains why the action happened. This is one of the most common uses.
Infinitive with “Too”: “The coffee is too hot to drink.” The structure “too + adjective + infinitive” indicates an excess that prevents the action.
Infinitive with “Enough”: “She is old enough to drive.” The structure “adjective + enough + infinitive” indicates sufficiency.
Bare Infinitive appears after modal verbs (“can,” “must,” “should”), after certain verbs of perception (“see,” “hear,” “watch”), and after causative verbs (“make,” “let,” “have”).
| Use | Example |
|---|---|
| Subject | To travel broadens the mind. |
| Object | They agreed to help. |
| Complement | Her dream is to become a doctor. |
| Adjective modifier | Find a chair to sit on. |
| Adverb of purpose | I came here to study. |
| After “too” | The bag is too heavy to carry. |
| After “enough” | He is strong enough to lift it. |
| Bare infinitive | Let me go. |
2. Gerund
A gerund is a verb form ending in “-ing” that functions as a noun. It looks identical to a present participle, but its role is nominal rather than adjectival.
Gerund as Subject: “Running keeps you fit.” The gerund is the subject of the sentence.
Gerund as Object: “I enjoy reading.” Many transitive verbs take a gerund as their object.
Gerund after Prepositions: “He is afraid of flying.” When a verb follows a preposition, it must take the gerund form.
Gerund in Compound Nouns: “A swimming pool,” “a writing desk.” The gerund modifies the noun to describe its purpose.
Gerund after Possessives: “I appreciate your helping me.” The possessive determiner before the gerund clarifies who performs the action.
Gerund after Certain Verbs: Some verbs exclusively take a gerund (see table below).
| Use | Example |
|---|---|
| Subject | Swimming is good exercise. |
| Direct object | She suggested leaving early. |
| After preposition | He left without saying goodbye. |
| After possessive | His snoring kept me awake. |
| Compound noun | A frying pan |
| After certain verbs | I avoid driving at night. |
3. Participle
Participles are verb forms that act as adjectives or help form continuous and perfect tenses.
Present Participle (-ing): Describes an ongoing or active quality.
- As adjective: “The barking dog woke the neighbors.”
- In continuous tenses: “They are waiting for the bus.”
- Reduced relative clause: “The woman standing by the door is my boss.” (replaces “who is standing”)
- Participial phrase: “Walking home, she found a wallet.” The phrase modifies the subject of the main clause.
Past Participle (-ed / irregular): Describes a completed or passive quality.
- As adjective: “The frightened child hid under the bed.”
- In perfect tenses: “She has finished her work.”
- In passive voice: “The letter was written yesterday.”
- Reduced relative clause: “The book written by Murakami is a bestseller.” (replaces “that was written”)
- Participial phrase: “Exhausted by the hike, they sat down to rest.”
Absolute Construction: A participial phrase that has its own subject.
- “The weather being fine, we went for a walk.”
- “All things considered, the decision was fair.”
Dangling Participles: A common error occurs when the participle’s implied subject does not match the main clause subject.
- Incorrect: “Walking through the park, the flowers were beautiful.” (flowers cannot walk)
- Correct: “Walking through the park, I admired the beautiful flowers.”
Verbs Followed by Gerund Only
| Verb | Example |
|---|---|
| admit | He admitted stealing the money. |
| avoid | She avoids eating junk food. |
| consider | They consider moving abroad. |
| delay | We delayed making a decision. |
| deny | He denied breaking the window. |
| enjoy | I enjoy playing chess. |
| finish | She finished writing the report. |
| imagine | Can you imagine living there? |
| keep | Keep smiling! |
| mind | Do you mind waiting? |
| practice | Practice speaking every day. |
| quit | He quit smoking last year. |
| recommend | I recommend reading this book. |
| risk | She risked losing everything. |
| suggest | They suggest taking the train. |
Verbs Followed by Infinitive Only
| Verb | Example |
|---|---|
| afford | I can’t afford to buy that. |
| agree | They agreed to help us. |
| appear | He appears to be lost. |
| decide | She decided to change jobs. |
| deserve | You deserve to win. |
| expect | I expect to arrive by noon. |
| fail | He failed to pass the test. |
| hesitate | Don’t hesitate to ask. |
| hope | We hope to see you soon. |
| learn | She learned to drive at sixteen. |
| manage | He managed to escape. |
| offer | They offered to drive us. |
| plan | We plan to leave tomorrow. |
| pretend | She pretended to be asleep. |
| promise | He promised to call. |
| refuse | They refused to answer. |
| seem | You seem to be tired. |
| tend | He tends to exaggerate. |
| want | I want to learn guitar. |
| wish | She wishes to apply for the job. |
Verbs That Change Meaning (Gerund vs. Infinitive)
A small but important group of verbs accept both forms with a shift in meaning.
| Verb | + Gerund | + Infinitive |
|---|---|---|
| stop | stop + gerund = quit doing something: “I stopped smoking.” (I no longer smoke) | stop + infinitive = pause in order to do something: “I stopped to smoke.” (I paused what I was doing to have a cigarette) |
| remember | remember + gerund = recall a past action: “I remember locking the door.” (I did it, and I recall it) | remember + infinitive = not forget a future obligation: “Remember to lock the door.” (don’t forget to do it) |
| forget | forget + gerund = cannot recall a past action: “I will never forget meeting him.” (the meeting happened) | forget + infinitive = fail to do something: “She forgot to send the email.” (she didn’t send it) |
| try | try + gerund = experiment to see the result: “Try adding more salt.” (experiment with it) | try + infinitive = make an effort: “I tried to open the jar.” (made an effort, possibly failed) |
| regret | regret + gerund = feel sorry about a past action: “I regret telling her.” (I told her, and I’m sorry) | regret + infinitive = give bad news formally: “We regret to inform you that your application was rejected.” |
| go on | go on + gerund = continue: “He went on talking for hours.” | go on + infinitive = do something next: “After the introduction, he went on to explain the theory.” |
Comparison Table: Finite vs. Non-Finite Verbs
| Aspect | Finite Verbs | Non-Finite Verbs |
|---|---|---|
| Conjugation | Change with tense, person, and number | No inflection for tense, person, or number |
| Subject agreement | Must agree with the subject | No subject agreement |
| Function | Main verb in a clause | Noun, adjective, or adverb |
| Tense marking | Carries tense (past, present, future) | No tense of their own (time is relative to main verb) |
| Can form a clause alone | Yes (“He runs.”) | No, needs a finite verb (“To run is healthy.”) |
| Examples | “She writes.”, “They wrote.” | Infinitive: “to write”; Gerund: “writing”; Participle: “written” |
Common Mistakes
- Gerund vs. infinitive after verbs: “I enjoy to swim” is incorrect. Use “I enjoy swimming.” Memorize which verb takes which form.
- Double preposition: “I am interested in to learn” is incorrect. Use “I am interested in learning.”
- Dangling participle: “Driving to work, the traffic was terrible” suggests the traffic was driving. Fix by matching the implied subject: “Driving to work, I hit terrible traffic.”
- Split infinitive myth: Splitting an infinitive (“to boldly go”) is grammatically acceptable in modern English.
- Confusing gerund and present participle: “Running water” (participle, adjective) vs. “Running is fun” (gerund, noun).
Practice Exercises
Exercise 1: Choose the correct form
- I enjoy (to swim / swimming) in the ocean.
- She decided (to move / moving) to London.
- He stopped (to smoke / smoking) last year.
- Remember (to buy / buying) milk on your way home.
- They avoided (to speak / speaking) about the incident.
- I regret (to inform / informing) you that the event is canceled.
- She tried (to open / opening) the jar, but the lid was stuck.
- We look forward to (to hear / hearing) from you.
Exercise 2: Complete the sentence with the correct non-finite form
- _______ (learn) a new language takes patience.
- She is afraid of _______ (fly).
- The man _______ (stand) at the corner is my uncle.
- _______ (exhaust) by the journey, he went straight to bed.
- He is too young _______ (drive).
- I appreciate your _______ (help) me with the project.
Exercise 3: Correct the error
- I want going home now.
- She made him to wait outside.
- He is interested in to study physics.
- Walking in the park, the flowers were beautiful.
- I suggest to take a break.
Answer Key
Exercise 1: 1. swimming, 2. to move, 3. smoking, 4. to buy, 5. speaking, 6. to inform, 7. to open, 8. hearing
Exercise 2: 1. Learning / To learn, 2. flying, 3. standing, 4. Exhausted, 5. to drive, 6. helping
Exercise 3: 1. “to go” (I want to go home now.), 2. “wait” (She made him wait outside.), 3. “studying” (He is interested in studying physics.), 4. “Walking in the park, I saw beautiful flowers.” (Fix the dangling participle.), 5. “taking” (I suggest taking a break.)
Conclusion
Non-finite verbs enhance English expressiveness by allowing flexible sentence structures. Practice identifying and using infinitives, gerunds, and participles to improve your grammar skills. Focus especially on the verbs that change meaning — these appear frequently in both writing and speech and are common sources of learner errors.
Resources
- Cambridge Grammar of English
- Oxford English Grammar
- Purdue OWL: Gerunds, Participles, and Infinitives
- EnglishGrammar.org: Non-Finite Verbs
- Grammarly: Verbals — Gerunds, Infinitives, and Participles
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