Gerunds and Infinitives

🎯 Lesson Goal

English uses different verb forms in different grammatical positions. This guide teaches the core framework first, then adds practical meaning-based categories.

💡 Key terms:
A base form is the plain verb with no ending and no to: go, study, speak.
An infinitive is to + base form: to go, to study, to speak.
A gerund is verb + -ing used like a noun: going, studying, speaking.

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🧭 Core Rule Map

Form	Main use	Examples
Gerund	Subject position	Learning English takes time. / Making mistakes is normal.
Gerund	After prepositions	before leaving, interested in learning, without asking
Gerund	After certain verbs	enjoy reading, avoid driving, finish working
Infinitive	After nouns	a reason to leave, a chance to speak, the ability to adapt
Infinitive	After adjectives	happy to help, difficult to explain, ready to begin
Infinitive	After certain verbs	want to go, decide to stay, hope to improve
Base form	After modal verbs	can go, should study, must leave

📌 Quick Memory Rules

Gerunds often work like nouns: Swimming is fun.
After a preposition, use a gerund: before leaving.
After some verbs, use a gerund: enjoy reading.
After many nouns, use an infinitive: a chance to speak.
After many adjectives, use an infinitive: happy to help.
After some verbs, use an infinitive: decide to go.
After modal verbs, use the base form: should study, not should to study.

🌎 Spanish Transfer Problems

Spanish idea	Common mistake	Natural English
Antes de salir...	Before to leave...	Before leaving...
Sin decir nada...	Without to say anything...	Without saying anything...
Quiero que estudies.	I want that you study.	I want you to study.
Debes estudiar.	You should to study.	You should study.
Tengo una razón para ir.	I have a reason for go.	I have a reason to go.

📘 Gerunds as Subjects

Use a gerund when an activity is the subject of the sentence.

Pattern	Example
Gerund + verb	Learning English takes time.
Gerund phrase + verb	Speaking clearly helps people understand you.
Gerund phrase + adjective	Making mistakes is normal.

💡 More formal alternative: To learn English takes time is possible, but in everyday English, Learning English takes time is usually more natural.

📕 Gerunds After Prepositions

After a preposition, use a gerund. This is one of the most important rules for Spanish speakers.

Expression	Pattern	Example
before	before + gerund	Check it before sending it.
after	after + gerund	After graduating, she moved abroad.
without	without + gerund	He left without saying goodbye.
instead of	instead of + gerund	Try listening instead of translating.
interested in	interested in + gerund	I’m interested in learning pronunciation.
good at	good at + gerund	She’s good at explaining grammar.
look forward to	look forward to + gerund	I look forward to meeting you.

⚠️ In look forward to and be used to, to is a preposition, not part of an infinitive.
✅ I look forward to seeing you.
❌ I look forward to see you.

📗 Gerunds After Certain Verbs

Some verbs are normally followed by a gerund.

Meaning group	Verbs	Examples
Enjoyment	enjoy, appreciate	I enjoy watching documentaries.
Avoidance	avoid, postpone, delay	She avoids driving at night.
Continuation/completion	keep, finish, quit	He finished writing the report.
Mental activity	consider, imagine, miss	We’re considering moving.
Suggestions	suggest, recommend	I recommend reading the article.

❌ I suggested to wait.
✅ I suggested waiting.

📙 Infinitives After Nouns

Use an infinitive after many nouns, especially nouns connected to possibility, need, plans, decisions, opportunities, and ability.

Noun	Pattern	Example
reason	a reason + infinitive	There’s no reason to worry.
chance	a chance + infinitive	I finally had a chance to speak.
opportunity	an opportunity + infinitive	This is an opportunity to learn.
decision	a decision + infinitive	Her decision to leave surprised everyone.
plan	a plan + infinitive	We need a plan to improve sales.
ability	the ability + infinitive	He has the ability to adapt.
need	a need + infinitive	There is a need to act quickly.
way	a way + infinitive	Is there a better way to explain this?

📒 Infinitives After Adjectives

Use an infinitive after many adjectives.

Adjective type	Examples	Sentence
Feelings	happy, glad, sorry, surprised	I’m happy to help.
Difficulty	easy, hard, difficult, impossible	It’s difficult to explain.
Readiness	ready, prepared, willing	Are you ready to begin?
Evaluation	important, necessary, dangerous	It’s important to practice.
Ability-related	able, unable, likely, unlikely	She is able to understand complex ideas.

📔 Infinitives After Certain Verbs

Some verbs are normally followed by an infinitive. Many of these connect to plans, goals, decisions, intentions, or responsibilities.

Meaning group	Verbs	Examples
Plans/decisions	decide, plan, choose, arrange	They decided to wait.
Goals/hopes	hope, want, aim, expect	I hope to improve.
Promises/offers	promise, offer, agree	She offered to help.
Effort/success	try, manage, fail	We managed to finish.
Refusal	refuse, decline	He refused to answer.

📓 Object + Infinitive

Some verbs use this pattern: verb + person/object + infinitive.

Verb	Pattern	Example
want	want someone + infinitive	I want you to practice.
ask	ask someone + infinitive	She asked him to wait.
tell	tell someone + infinitive	They told us to leave.
allow	allow someone + infinitive	The app allows users to edit videos.
encourage	encourage someone + infinitive	My teacher encouraged me to speak.
remind	remind someone + infinitive	Please remind me to pay the bill.

❌ I want that you listen.
✅ I want you to listen.

🎯 Infinitives for Purpose

Use an infinitive to explain the purpose of an action: why someone does something.

Action	Purpose	Sentence
I study every day	improve my English	I study every day to improve my English.
She moved to another city	find work	She moved to another city to find work.
We use examples	make the rule clear	We use examples to make the rule clear.

📓 Modal Verbs + Base Form

After modal verbs, use the base form, not an infinitive.

Modal	Correct pattern	Example
can	can + base form	She can speak English well.
should	should + base form	You should review the lesson.
must	must + base form	We must leave soon.
might	might + base form	They might arrive late.
will	will + base form	I will call you tomorrow.

🧠 Advanced Meaning Changes

Some verbs can be followed by a gerund or an infinitive, but the meaning changes.

Verb	Gerund meaning	Infinitive meaning
stop	stop + gerund = quit an activity He stopped smoking.	stop + infinitive = pause in order to do something He stopped to smoke.
remember	remember + gerund = remember a past action I remember meeting her.	remember + infinitive = not forget a task Remember to call me.
forget	forget + gerund = forget a past experience I’ll never forget seeing that film.	forget + infinitive = fail to do something I forgot to send the email.
try	try + gerund = experiment with a method Try speaking more slowly.	try + infinitive = make an effort I tried to explain.
mean	mean + gerund = involve This job means working weekends.	mean + infinitive = intend I meant to call.
need	need + gerund = needs to be done The car needs washing.	need + infinitive = someone must do something I need to wash the car.

🌎 Advanced Spanish Comparison

Spanish structure	Natural English pattern	Example
antes de + infinitive	before + gerund	Antes de salir → Before leaving
sin + infinitive	without + gerund	Sin preguntar → Without asking
para + infinitive	infinitive for purpose	Para mejorar → To improve
noun + para + infinitive	often noun + infinitive	una oportunidad para aprender → an opportunity to learn