Gerunds and Infinitives

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

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

We use the bare infinitive (the infinitive without 'to'):

• After modal verbs - I can meet you at six o'clock
• After 'let', 'make' and (sometimes) 'help' - The teacher let us leave early
• After some verbs of perception (see, watch, hear, notice, feel, sense) - I watched her walk away
• After expressions with 'why' - why go out the night before an exam?

On the following video we can see a mix of songs that includes at least one sentence using Gerund or Infinitive;