Infinitive or -ing?

Sometimes we need to decide whether to use a verb in its:

• -ing form (doing, singing)
  
  or
  
  
• infinitive form (to do, to sing).

For example, only one of the following sentences is correct. Which one?

• I dislike working late. (???)
• I dislike to work late. (???)

Exercises here, here, here, here and here.

When to use the infinitive

The infinitive form is used after certain verbs:
- forget, help, learn, teach, train
- choose, expect, hope, need, offer, want, would like
- agree, encourage, pretend, promise, recommend
- allow, can/can't afford, decide, manage, mean, refuse

• I forgot to close the window.
• Mary needs to leave early.
• Why are they encouraged to learn English?
• We can't afford to take a long holiday.

The infinitive form is always used after adjectives, for example:
- disappointed, glad, happy, pleased, relieved, sad, surprised

• I was happy to help them.
• She will be delighted to see you.

This includes too + adjective:

• The water was too cold to swim in.
• Is your coffee too hot to drink?

The infinitive form is used after adjective + enough:

• He was strong enough to lift it.
• She is rich enough to buy two.

When to use -ing

The -ing form is used when the word is the subject of a sentence or clause:

• Swimming is good exercise.
• Doctors say that smoking is bad for you.

The -ing form is used after a preposition:

• I look forward to meeting you.
• They left without saying "Goodbye."

The -ing form is used after certain verbs:
- avoid, dislike, enjoy, finish, give up, mind/not mind, practise

• I dislike getting up early.
• Would you mind opening the window?

Some verbs can be followed by the -ing form or the infinitive without a big change in meaning: begin, continue, hate, intend, like, love, prefer, propose, start. It started to rain. It started raining. I like to play tennis.