I agree with Angela. You have to use it everyday and in every chance you get. You even have to start thinking in English. Little by little it will come. Watching a movie or TV show in English helps too.

A gerund is similar to a noun but it is not a noun. For example, He is drinking coffee. "is" is your verb. "drinking" is your gerund. Even if the sentence is past tense -> He was drinking coffee. The gerund never changes. It is always -ing. He's a website with some more examples: http://www.chompchomp.com/terms/gerund.htm

First notebook entry: Introducing myself

I'm Mayerlin Noriega.
I'm from Venezuela
I'm learning english because I am going to study petroleum engineering <strike>on</strike> in september, and I need to improve this language.
I think that it is an important thing for my career and I like it.
for me it is really useful because I always <strike>see</strike> watch american sitcoms.
I would like to be better <strike>according</strike> in particular <strike>to</strike> at pronunciation skills.

Be careful with watch and see (ver y mirar)

I think grammar in Use is a pretty good book. There are a few sections that may be difficult for a pre-intermediate but you can skip those and come back to them as they progress. http://www.amazon.com/English-Grammar-Use-Answers-Intermediate/dp/0521532892/ref=sr_1_1/175-8450856-0460625?ie=UTF8&s=books&qid=1279900494&sr=8-1

AnnoyingとかBothersome