GERUNDS

Gerund is a noun derived from the verb plus-ing, for example swimming, eating, fishing, shopping, dancing, and singing. When observed, gerund has the same form with a present participle, gerund difference serves as a noun, while the present participle as an adjective describing the noun.

In a sentence, the gerund function as:
a. subject (subject)
b. complement subject (subjective complement)
c. direct object (direct object)
d. preposition object (object of preposition)
e. apposition (appositive)


Subject
Gerund as the principal subject of the sentence, for example:
- Swimming is good service.
- Your singing is very beautiful.
- Studying needs time and patience.
- Playing tennis is fun.
- Reading Home is Easier Than speaking it.

Subjective complement
Gerund as a complement to the subject in a sentence will usually be preceded to be located between the subject and subjective complement, for example:
- My favorite sport is running.
- My favorite activity is reading.

Direct Object
Gerund as the direct object in sentences, for example:
- I enjoy dancing.
- She likes dancing.
- Thank you for your coming.
- I hate arguing.

Object of Preposition
Gerund as an object of the preposition which is located after the preposition. Preposition is often used is of, on, no, with, without, at for, after, before, Because of, to, like, about, for, by, ins.
Example:
- He is Tired of gambling.
- I am fond of eating meatballs.
- He insisted on seeing her.
- I have no objection to hearing your story.
- You will of notes be clever without studying.
- They are good at telling funny stories.
- In sleeping I met you in the park.

Appositive
Gerund as apposition or affirming the sentence, for example:
- My hobbies, fishing, is interesting.
- I do not like quarrelling, a useless job.
My hobby is fishing and fishing is interesting is placed adjacent in a sentence as an appositive (fishing is the apposition of my hobbies), as well as example sentences below.

http://catatanbahasainggris.blogspot.com/2009/04/gerunds.html