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Infinitive or -ing?

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

to-infinitive form - to do, to sing

or in its:

-ing form - doing, singing

For example, only one of the following sentences is correct:

Which one?!

Use infinitive...

after adjectives, for example:

This includes "too + adjective" and "adjective + enough". Look at these example sentences:

after certain verbs, for example:

Look at these example sentences:

Use -ing...

when the word is the subject of a clause:

after a preposition:

after certain verbs:

Look at these example sentences:

Some verbs can be followed by the infinitive or -ing form 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 / I like playing tennis