Infinitive as Subject
Infinitive (Subject) Verb Object
To procrastinate causes a lot of problems.
Not to go ahead proved a mistake.
The infinitive as subject is formal and rarely used.
People are more likely to use a gerund or other
causes a lot of problems.
Not going ahead proved a mistake.
Infinitive as Object
Subject Verb Infinitive (Object)
Not everyone wants to procrastinate
He decided not to go ahead.
(These are verbs that take an infinitive object. Do
not use a gerund instead.)
Infinitive as Subject Complement
Subject Verb Infinitive
His job is to motivate people.
Their real intention is not to succeed.
In most cases, a gerund is also correct in this kind of
His job is motivating people.
Their real intention is not succeeding.
It + Infinitive
It Be Adjective For/of noun or
It is foolish for Alice
It was wrong of Hal
not to go ahead.
(to go ahead = to
In this kind of sentence, use the infinitive and not a gerund.
Verbs Followed by Infinitives
Adjectives Followed by Infinitives
Hal is reluctant to complete his work on
He’s careful not to make mistakes.
They’re happy to hear the test has
Nouns Followed by Infinitives
He can always
reasons to put off studying.
It seems like the thing to do.
reluctance to finish a job.
Too/Enough with Infinitives
The project is too complicated to finish on time.
Alice types too slowly to meet the deadline.
Steve is intelligent enough to understand the situation.
He didn’t call quickly enough to get the job.
Enough + Noun Infinitive
to pass the test.intelligence enough
Active and Passive Infinitives
Active Infinitives Passive Infinitives
She plans to invite
They expect to be invited.
She was glad to have
They were happy to have
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