Gerund and Infinitive

Gerunds

We use gerunds (verb + ing):

• After certain verbs - I enjoy singing.
• After prepositions - I drank a cup of coffee before leaving.
• As the subject or object of a sentence - Swimming is good exercise.

Infinitive

We use 'to' + infinitive:

• After certain verbs - We decided to leave.
• After many adjectives - It's difficult to get up early.
• To show purpose - I came to London to study English.