This document discusses the uses of infinitives, gerunds, and bare infinitives in English. 1. Gerunds are used as nouns or after prepositions. They also follow certain verbs and idiomatic expressions. 2. To-infinitives are used to indicate purpose, after modal verbs and verbs like "want" and "help", and in certain constructions. 3. The bare infinitive is used after modal verbs except "have to" and in expressions like "let me go" or "would rather". Some verbs like "see" can be followed by a gerund or bare infinitive.

1. Infinitives and Gerunds
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3 basic verb forms:
V-ING. Gerund
TO-INF. Infinitive ( with "to" )
INF. Infinitive (without "to" )
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2.  USES OF THE GERUND: (V-ING)
1.- The gerund is used as a noun:
Smoking is bad for your health.
Her hobby is painting.
2.- It´s used after prepositions:
Touch your toes without bending your knees.
After swimming I felt cold.
He is thinking of NOT going abroad.
3.- After verbs such as:
FINISH IMAGINE GIVE UP PUT OFF
ENJOY DENY MISS POSTPONE
MIND AVOID GO ON ADMIT SUGGEST
INVOLVE KEEP ON APOLOGIZE FOR INSIST ON
NEGLECT
* DENY / REGRET / SUGGEST + THAT + SUBJECT + VERB

3. 4.- After certain idiomatic expressions:
THERE / IT´S NO USE ( no merece la pena)
CAN´T HELP (no poder evitar)
BE FED UP WITH (estar harto de)
CAN´T STAND (no poder soportar, aguantar)
CAN´T BEAR (no poder soportar)
FEEL LIKE (apetecer)
GO +ing (para actividades de recreo): Go hiking/ dancing.
IT´S ( NOT ) WORTH sightseeing ( no merecer la pena)
THERE IS (NO) POINT IN (no hay necesidad de)
TO BE USED TO (estar acostumbrado a)
LOOK FORWARD TO (desear)
PREFER+gerund TO+gerund (preferir__________ a __________)
NEED (en sentido pasivo): Your car needs cleaning.
It´s no worth wasting your time.
She was used to getting up early.
I´ m looking forward to hearing from you.
I prefer going out to staying here.

4. USES OF TO-INFINITIVE
1.- Infinitive of purpose.
Why did you go out? To post a letter.
We shouted to warn them of the danger.
*Knives are for cutting. (in a general sense)
2.- Verbs with to-infinitive.
AGREE MANAGE HOPE AFFORD REFUSE DECIDE
APPEAR LEARN PROMISE PLAN SEEM OFFER
ARRAGE PRETEND
I hope to pass my exams.
We decided not to go to Paris.
* Verb + wh-word + To-INF.
(ask / decide / know / remember / forget / explain / understand )
We decided when to go /we could go to Paris.

5. 3.- Verb +( Complement ) + TO-INF.
WANT HELP INVITE WOULD LIKE
ASK TELL WARN WOULD PREFER
ADVISE EXPECT REMIND ENCOURAGE
She wanted to stay instead of going.
She wanted me to stay.
4.- TO-INF with some constructions.
4.1.- Pronoun/noun + to-infinitive:
We have some homework / something to do.
4.2.- Too + adjective + to-infinitive:
This is too hot to drink.
4.3.- Enough + noun + to-infinitive:
There is enough water for everybody to drink.
4.4.- Adjective/adverb + enough + to-infinitive.
This boy is old enough to watch this film.

6. 5.- Verbs followed by a gerund or infinitive.
5.1.- Stop
He stopped smoking last year. (dejó de fumar).
He stopped to smoke a cigarette. (Se paró para fumar).
5.2.- Try
He tried adding salt and water.(probar, experimentar)
Martin tried to pass the test. (intentar, hacer el esfuerzo)
5.3.- Remember /forget / regret.
A.- She will never forget visiting London. (la acción de visitar es anterior)
David always forgets to visit his aunt. (la acción de visitar es posterior a
la de olvidar)
B.- I remember closing the door.( la acción de cerrar es anterior/ me
acuerdo de haber cerrado la puerta)
I remembered to close the door. (la acción de cerrar es posterior / me
acuerdo que tengo que cerrar la puerta).
C.- She regrets wasting so much money. (ya se ha gastado el dinero y lo
lamenta)
She regrets to waste so much money. ( Lamenta tener que gastarlo)

7. USES OF THE BARE INFINITIVE
(INFINITIVE WITHOUT TO).
1.- Modal verbs (except : have to / ought to / need)
2.- MAKE: They made me pay.
3.- LET: Let me go!
4.- WOULD RATHER:I would rather go than stay. (prefer)
5.- HAD BETTER: you had better study English .(advise).
VERBS FOLLOWED BY GERUND OR BARE INFINITIVE.
SEE/ HEAR / FEEL / WATCH may be followed by both constructions.
I heard him playing the guitar ( a part of the action)
I heard him play a music concert. (the complete action)