Gerund and Infinitive

1.  Adjectives followed by the infinitive.

Examples :
He was surprised to see his computer shutting down.

2. Gerunds as Subject (subject).

Gerunds can appear at the beginning of a sentence when used as a subject. The real subject is a noun. If there is a verb that is positioned as a subject, then the verb must be changed to a noun (gerund). Add to the verb that is the subject.

Example:

Singing is my favorite hobby, (Singing is usually a verb, but this is the name of an activity.)

working too long makes them bored

3.Direct Object

The same applies to the points above. These objects are sometimes also formed by nouns. If the object of your sentence is a type of verb, then add ING to the verb.
Example :

I enjoyed my travelling this year. (The subject's direct object is "my traveller this year.")

I don't mind visiting you

4.  Object of Preposition

Gerund as a preposition object placed after the preposition. Prepositions that are often used are from, on, no, with, without, at for, after, before, because, to, like, about, for, by, in,
Example :

He is good at dancing korean

I’m interested in reading book

Some people consider my interest in traveling an obsession

5. Gerund as Subject complement

Gerund as a complement to the subject in a sentence is usually always preceded as a complementary subject between and subjective

Example:

My favorite hobby is Singing.

My favorite activity is working to get lot of money.

6.Used after posessive
Example :

I don’t mind her smoking here.

I will finish my reading later.

7. Forming nouns
Examples :

Let’s go to shoping in the market.

My grandma lost his walking  stick.