Gerunds and Infinitives

Introduction
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Here is a brief review of the differences between gerunds and infinitives.
Gerunds are formed with ING: walking, talking, thinking, listening
Infinitives are formed with TO: to walk, to talk, to think, to listen
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Gerunds and infinitives can do several jobs:
Both gerunds and infinitives can be the subject of a sentence::
Writing in English is difficult.
To write in English is difficult.
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Both gerunds and infinitives can be the object of a verb::
I like writing in English.
I like to write in English.
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But...
Only gerunds can be the object of a preposition::
We are talking about writing in English.
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It is often difficult to know when to use a gerund and when to use an infinitive. These guidelines may help you:
Gerunds are often used when actions are real, concrete or completed::
I stopped smoking.
(The smoking was real and happened until I stopped.)
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Infinitives are often used when actions are unreal, abstract, or future::
I stopped to smoke.
(I was doing something else, and I stopped; the smoking had not happened yet.)