not at all... you did right..

Kahvaltý ettim surely means I was breakfast - shouldn´t it be kahvaltý yaptým´?

Hi, you can use both in Turkish for I had breakfast:

kahvaltý etmek, kahvaltý yapmak..

both can be used, no difference

thanks for explanation

Not at all..

 There is a really good explanation of how to use the ´ip´ suffix here

This is how my grammar book explains it.

 Mine too!  I find all these conflicting explanations very confusing! 

In the turkish language book of Michel Bozdemir. The suffixes are given like this:

"-(y)ebil/-(y)abil

görmek görebilmek

konuþmak konuþabilmek

-negation is exprimed by -(y)eme/-(y)ama

yapamamak

gidememek"

However, since turkish is an agglutinante language, it is not wrong to think that the suffixes are -e/-a + bil and -e/-a + me,ma but useless I think. 

Please don´t think complicated.  whatever this books says is wrong about present continous.. because as the name of the tense says, it is a continuing action.  Like at the moment I am writing to you.. so how do I say in Turkish?

Sana yazýyorum.

When you say yazarým, then it is like.. everyday I write 2 pages. "her gün iki sayfa yazý yazarým".. So anything which consist -yor is like -ing in English...

The second thing, if you think of can / able to as not only ebil / abil, then it is easy, because when we want to say "to be able to read" in turkish, we say "okuyabilmek"..  And Sonunda, I don´t know if you kept on writing "abýl" on purpose, or just a misspelling, but with this form, it is always abil, ebil not with the "ý".

If anything bothers you, please go ahead and I will try to help out.

 That would be kahvaltýydým