An infinitive is the base form of a verb with to: to go, to study, to eat. It names an action without placing it in time. In English, the infinitive often appears after another verb, after adjectives, or at the start of a sentence. The form stays the same for every subject. You can connect it to the idea of a verb in its simplest form by comparing it with the bare verb forms used in Verbs.

Basic to infinitive structure

Example	Pattern
I want to learn Spanish.	A to infinitive uses to before the base verb.
She hopes to visit her aunt tomorrow.	The verb after to stays in its base form.
To travel is my biggest dream.	A to infinitive can act like a noun in a sentence.

A bare infinitive is the base verb without to: go, study, eat. It appears after modal verbs, after many auxiliaries, and after a few other fixed patterns. English uses it in sentences like She can swim and They did finish early. The main verb stays in its base form, so can goes and did went are not possible. The bare infinitive is also the form that follows the modals in Modal Verbs.

Base verb without to

Example	Pattern
We can leave now.	A bare infinitive uses the base verb without to.
You should rest after the trip.	After a modal verb, use the bare infinitive.
Do you know the answer.	After do support, use the bare infinitive in questions and negatives.

Verbs of intention often take a to-infinitive after them: want to leave, plan to travel, decide to call, choose to stay. The first verb shows the intention, and the infinitive names the action that follows that intention. In everyday English, these verbs are very common when talking about future actions, personal decisions, and plans. A manager might decide to hire someone, and a student might plan to study abroad.

To infinitive after intention verbs

Usage	Explanation	Example
Expressing desire	Use to infinitive after verbs like want when you say what someone hopes to do.	I want to try the new cafe.
Making a plan	Use to infinitive after verbs like plan when you talk about an arranged future action.	They plan to move in June.
Choosing a course of action	Use to infinitive after verbs like decide and choose to name the action picked.	We decided to stay home tonight.

Some verbs introduce a to-infinitive to show hope, agreement, or refusal: hope to win, promise to help, agree to meet, refuse to sign. These verbs usually point to a later action or a response to another person. In a sentence like They agreed to wait, the first verb shows consent and the infinitive shows the action accepted. English often uses this pattern with commitments, polite arrangements, and personal reactions.

To infinitive after agreement verbs

Usage	Explanation	Example
Showing expectation	Use to infinitive after hope when you say what you expect or wish will happen.	I hope to hear from you soon.
Making a commitment	Use to infinitive after promise when you give your word about a future action.	She promised to call after dinner.
Accepting or refusing	Use to infinitive after agree or refuse when you accept or reject an action.	He refused to answer the question.

Modal verbs take a bare infinitive after them: can go, must leave, should study, might rain. The modal carries the grammar of time, certainty, ability, or obligation, and the main verb stays in its base form. Auxiliaries also work with a bare infinitive in patterns such as do support in questions and negatives: Do you like tea?, They do not know. In the same way, forms like is, are, was, and were combine with participles, while the main verb remains controlled by the auxiliary system described in Auxiliary Verbs.

Auxiliary forms before bare infinitive

Verb	Subject	Infinitive	Conjugation	Example
	I	do	do	I do help when I can.
	you	do	do	You do understand the plan.
	he	do	does	He does work on Saturdays.
	we	do	do	We do keep the door closed.

Scramble

Let and make usually take a bare infinitive after the object: let him go, make her wait. The object comes before the base verb, and the base verb has no to. Help can take either form: help her carry or help her to carry. In fast, natural speech, the version without to is very common. These patterns are useful with everyday actions and with verbs such as To Make, To Go, and To Do.

Verb patterns with bare infinitive

Usage	Explanation	Example
Permission or allowance	Use let + object + bare infinitive when someone allows another person to do something.	My parents let me stay out late.
Causing an action	Use make + object + bare infinitive when one person causes another to do something.	The noise made us laugh.
Assistance with action	Use help with to or without to when you say one person assists another.	She helped me carry the boxes.

To make a negative infinitive, place not before the infinitive: not to go, not to worry, not to be late. After many verbs, the negative form follows the same pattern as the positive form, only with not added before the infinitive. In informal speech, the to may be dropped in some structures, but the negative idea stays the same: They decided not to leave. The word not belongs with the infinitive phrase, not with the subject or the main verb.

Negating infinitives with not

Example	Pattern
I asked him not to wait.	Put not before a to infinitive to make it negative.
She decided not to worry.	A negative infinitive can show refusal or advice.
We left early not to miss the train.	The negative word stays directly before the infinitive phrase.

Infinitives appear in question-like structures after auxiliaries and other verbs that ask about ability, choice, or obligation: Can you help?, Should I call?, Do they want to stay? In these sentences, the auxiliary or modal comes before the subject in a question, and the main verb stays in base form. Infinitives also appear after question words in indirect questions: I do not know what to say, She asked where to sit. The question word comes first, then to plus the base verb.

Infinitives after question forms

Example	Pattern
Can I join the game?	Use a bare infinitive after an auxiliary in a question.
Tell me where to go.	Use a bare infinitive after a question word in an indirect question.
Did you see the sign?	In question style, the infinitive stays in base form after the helper verb.

A to-infinitive can show purpose: I went to see her, She studied to pass the exam, He moved closer to hear better. The infinitive explains why someone does something. It can also show a planned result or an intended next step: They called to confirm the booking. In everyday English, this pattern is common with travel, work, study, errands, and decisions, especially when the action is simple and the purpose is clear.