GERUND OR INFINITIVE?

Gerunds can be used:

As the subject of a sentence (smoking is bad for you, drinking too much is unhealthy)

As the object of the sentence (after verbs like enjoy, hate, spend, stop etc)

After preposition and phrasal verbs and as the complement of a verb (His hobby is collecting stamps; he will keep on trying until he succeeds; she is great at swimming)

Infinitives are used:

As the subject of the sentence in formal or older style English (To err is human)

As the object of the sentence (after verbs like agree, decide, forget, try etc)

To express purpose; why someone does something (I am studying to pass my exam)

After adjectives which express wishes or personal feeling about the importance of something or make a value judgment (This is easy to understand)

The infinitive without to is used:

After most modal verbs (You mustn't smoke, He could run really quickly)

After make and let (You made him walk away, let me see that)

Remember:
A gerund is the name for an "-ing" form which acts like a noun.
The infinitive is another word for the base form of the verb, with or without "to".

Gerunds and Infinitives
There are some verbs which can only to followed by the -ing form:
I enjoy playing football (NOT to play)
He finished singing (NOT He finished to sing)

Verbs normally followed by -ing

1	Admit		7	Excuse
2	Avoid		8	Finish
3	Detest		9	Forgive
4	Dislike		10	Imagine
5	Enjoy		11	Suggest
6	Escape		12	Understand

After many verbs we use the infinitive:
Decide - She decided to study English
Pretend - They pretended to like the food
Start - It started to rain

Verbs normally followed by the infinitive

1	Ask		9	Help
2	Afford		10	Learn
3	Agree		11	Need
4	Choose		12	Pretend
5	Expect		13	Promise
6	Forget		14	Refuse
7	Remember		15	Want
8	Try		16	Would like

Some of the verbs that are followed by the infinitive can be followed by an object + infinitive:

Help - She helped him to do his homework
Remind - He reminded her to lock the door

Some verbs can be followed by either the infinitive or the -ing form with no change in meaning:

Love - I love to swim /swimming
Like - I like to shop / shopping

But, although some verbs can be followed by both the infinitive and -ing with no great change in meaning, there are some verbs where the meaning does change, these include:

Stop - I stopped smoking (I quit); I stopped to smoke (I stopped what I was doing so that I could smoke)
Remember - I remembered writing the e-mail (a memory); I remembered to write the e-mail (I didn't forget)

Now practise it 

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