1.
GERUNDS AND INFINITIVES
When we need to use a verb in a nominal form, that is, a verb working
as a noun, it can take the form of a gerund or an infinitive.
LOOK:
I like TV series. I like watching TV in English.
It is important to practice my listening skills.
Speaking is very important, too.

2.
INFINITIVES
We use the infinitive (to play, to be...)

After some verbs: decide, help, learn, need, offer, plan,
pretend, promise, start, want, would like...
I want to learn English.

After adjectives:
It's important not to be shy.

Infinitive of pourpose: to say why you do something.
I want to learn English to communicate with many people.

3.
GERUNDS
We use the gerund (V-ing)

After some verbs: enjoy, like, love, hate, spend, don't mind...
I enjoy reading.

After prepositions:
I am interested in knowing new cultures.

As the subject of a sentence:
Learning English is great!

4.
VERBS FOLLOWED BY GERUND OR INFINITIVE
Be careful! Some verbs can be followed by gerund or inf:
Try:

Followed by gerund: experiment. Try turning it off.

Followed by inf: general meaning. Try not to make noise!
Remember/ forget:

With gerund: it reffers to the past. Do you remember
learning to walk?

With inf: to the present or future. Don't forget to get your
keys!

5.
VERBS FOLLOWED BY GERUND OR INFINITIVE
Start.

Followed by gerund, it reffers to a long process: I started
working here 10 years ago.

Inf: more general. It started to rain.

6.
VERBS FOLLOWED BY GERUND OR INFINITIVE
Start.

Followed by gerund, it reffers to a long process: I started
working here 10 years ago.

Inf: more general. It started to rain.