Grammar

gerund or infinitive
Use the gerund (verb+ ing):
after prepositions
after certain verbs (e.g. like, love, hate, etc.)
as the subject of a sentence

What are you thinking of doing next summer?
Ironing is one job I hate doing.
Use to + infinitives:
after adjectives
after certain verbs (e.g. need, want, decide, etc.)
to express purpose/reason

Do you find it difficult to fall asleep?
Do you want to go out tonight?
I’m studying English to get a better job.
Common verbs that take the gerund (ing form):

like, love, hate, enjoy, mind, finish, stop, suggest, recommend
Common verbs that take the to + inifinitive:

would like, want, need, decide, hope, expect, plan, forget, seem, try, promise, offer, refuse, learn, manage
I’ll never forget playing with my dog when I was a little boy.
Please don’t forget to switch off the lights before you go.
How long does it take you to travel to Verona?