Forming the infinitive
The infinitive is the basic form of a verb. In English, when we mention the infinitive, we are typically talking about the present infinitive, which is the most commonly used form. However, there are four other variations of the infinitive: the perfect infinitive, the perfect continuous infinitive, the continuous infinitive, and the passive infinitive.
the to-infinitive = to + baseThe present infinitive has two forms:
- the zero infinitive = base
The present infinitive base is the verb form you will find in a dictionary.
| To-infinitive | Zero infinitive |
|---|---|
| to sit | sit |
| to eat | eat |
| to have | have |
| to remember | remember |
The negative infinitive is formed by putting not in front of any form of the infinitive.
Examples
- I decided not to go to London.
- He asked me not to be late.
- I’d like you not to sing so loudly.
- I’d rather not eat meat.
- I might not come.
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Functions of the to-infinitive
The to-infinitive is utilized in various sentence structures, frequently indicating the purpose behind something or someone’s viewpoint on something. It is also employed after a wide range of different verbs.
The to-infinitive to indicate the purpose or intention of an action
In this case to has the same meaning as in order to or so as to.
Examples
- She came to collect her pay cheque.
- The three bears went to find firewood.
- I am calling to ask you about dad.
- You sister has gone to finish her homework.
The to-infinitive as the subject of the sentence
This is a formal usage and is far more common in written English than spoken
Examples
- To be or not to be, that is the question.
- To know her is to love her.
- To visit the Grand Canyon is my life-long dream.
- To understand statistics, that is our aim.
The to-infinitive to indicate what something can or will be used for
In this pattern, the to-infinitive follows a noun or pronoun.
Examples
- The children need a garden to play in.
- I would like a sandwich to eat.
- I don’t have anything to wear.
- Would you like something to drink?
The to-infinitive after adjectives
There is a common pattern using the to-infinitive with an adjective. These phrases are formed:
subject + to be + adjective + (for/of someone) + to-infinitive + (rest of sentence)
| Subject | + to be | + adjective | (+ for/of someone) | + to-infinitive | (+ rest of sentence) |
|---|---|---|---|---|---|
| It | is | good | to talk. | ||
| It | is | good | of you | to talk | to me. |
| It | is | important | to be patient. | ||
| It | is | important | for Jake | to be patient | with his little brother. |
| I | am | happy | to be | here. | |
| The dog | is | naughty | to destroy | our couch. |
The to-infinitive to make a comment or judgement
To use the to-infinitive when making a comment or judgement about a noun, the pattern is:
Subject + to be + noun phrase + to-infinitive
| Subject | + to be | + noun phrase | + to-infinitive |
|---|---|---|---|
| It | was | a stupid place | to park. |
| That | is | a dangerous way | to behave. |
| What you said | was | a rude thing | to say. |
| This | is | the right thing | to do. |
| Those | were | the wrong kind of eggs | to buy. |
| Jim | is | the best person | to hire. |
The to-infinitive with adverbs
The to-infinitive is commonly employed with the adverbs “too” and “enough” to clarify the cause of our contentment or dissatisfaction. In this structure, “too” and “enough” are positioned before or after the adjective, adverb, or noun they modify, just as they would be without the to-infinitive. Then, we add the to-infinitive to provide the rationale for why the quantity is excessive, sufficient, or insufficient. Usually, you can eliminate the to-infinitive and everything following it, and the sentence will still be grammatically correct.
Examples
- There’s too much sugar to put in this bowl.
- I had too many books to carry.
- This soup is too hot to eat.
- She was too tired to work.
- He arrived too late to see the actors.
- I’ve had enough food to eat.
- She’s old enough to make up her own mind.
- There isn’t enough snow to ski on.
- You’re not old enough to have grand-children!
The to-infinitive with question words
The verbs ask, decide, explain, forget, know, show, tell, & understand can be followed by a question word such as where, how, what, who, & when + the to-infinitive.
Examples
- She asked me how to use the washing machine.
- Do you understand what to do?
- Tell me when to press the button.
- I’ve forgotten where to put this little screw.
- I’m not sure I know who to call.
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Functions of the zero infinitive
The zero infinitive after auxiliaries
Examples
- She can’t speak to you.
- He should give her some money.
- Shall I talk to him?
- Would you like a cup of coffee?
- I might stay another night in the hotel.
- They must leave before 10.00 a.m.
The zero infinitive after verbs of perception
With verbs of perception, the pattern is verb + object + zero infinitive.
Examples
- He saw her fall from the cliff.
- We heard them close the door.
- They saw us walk toward the lake.
- She felt the spider crawl up her leg.
The zero infinitive after the verbs “make” and “let”
Examples
- Her parents let her stay out late.
- Let’s go to the cinema tonight.
- You made me come with you.
- Don’t make me study that boring grammar book!
The zero infinitive after the expression “had better”
Examples
- We had better take some warm clothing.
- She had better ask him not to come.
- We had better reserve a room in the hotel.
- You’d better give me your address.
- They had better work harder on their homework.
The zero infinitive with “why”
The question word why is followed by the zero infinitive when making suggestions.
Examples
- Why wait until tomorrow?
- Why not ask him now?
- Why leave before the end of the game?
- Why walk when we can go in the car?
- Why not buy a new bed?
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I am Nilay, an experienced English Language Assessment Director at the International English Test, where I have been working full-time since February 2020. I specialize in helping people worldwide validate their English proficiency through comprehensive assessments and certifications.
Before joining the International English Test, I worked as a self-employed English Language Assessment Consultant from January 2015 to December 2019. During this time, I assisted companies and individuals in improving their language skills, helping them achieve their academic and professional goals.
I hold a degree in Engineering and have also studied at Shafston International College in Australia. My educational background has equipped me with the tools to make a meaningful impact in the field of English language learning. Additionally, I enjoy sharing my expertise through articles that explore effective teaching methods and language assessment strategies, contributing to the International English Test and the broader assessment community.
