-ing forms are used in verb forms with auxiliary verbs, as nouns, and after certain verbs like dislike. They are also used after prepositions. Participles clauses can include -ing forms. Infinitives are used with "to" to express purpose or after certain verbs. They are also used without "to" after modal verbs and verbs like let, make, notice. Gerunds express real, completed actions while infinitives express unreal or future actions, as shown in the examples of forgetting vs forgot and stopping vs stopped. The document provides guidance on the different uses of -ing forms and infinitives.

1. Main uses of - ing forms
• In verb forms, with auxiliary verbs
Crime levels are rising
b) Like nouns
Swimming is prohibited
c) After certain verbs
People dislike queuing.
d) After all prepositions
You can be fined for speeding.
c) In participle clauses
Learning English, I fell asleep.

2. Main uses of infinitives
With to
b) To express purposes
To get answer to this question, she asked her
teacher.
b) After certain verbs
I promise to learn by heart the irregular verbs.
c) After too and enough
It’s too complicated to explain. It’s not important
enough to worry about.
Without to
a) After modal verbs:
All accidents must be reported.
b) After let, make, notice, feel, see, hear, watch.
I like films that make me laugh.

3. • Gerunds are used to express actions that
are real, concrete and completed.
• Infinitives are used to express actions that
are unreal, abstract or may be in the
future.

4. • Compare:
• I forget locking the door.
• I forgot to lock the door.
• I stopped smoking.
• I stopped to smoke.
• Do you like learning foreign languages?
• I like to advice with my mum.

5. Create your own sentences: