I have a problem.

I don't understand what does this "result" should look like in present perfect, because when I see in movie that a character says : I forgot it. The result is that he doesn't remember it or maybe he didn't do something. so how should I interpretate it ?

Examples :

1.

• "Aaaaaah I forgot, to buy something for my friend"

Interpretation :normal coversation betwen two characters (my interpretetion is that she use "PAST" simple because she wanted to give an infomation, even if the result is that she doesn't have this thing)

OR

• "Aaaaah I've forgotten, to buy something for my friend"

The result is that he doesn't have this thing he had to buy for his friend

2.

• "Hey Tom.There was an apple in the fridge, what happened to him ?

Yea I ate it."

Interpretation - (even if the apple wasn't in fridge "result" we are informing him, or I guess it is supposed to be some kind of informal thing. Or maybe this is some kind of emphesize)

OR

• "Hey Tom. There was an apple in the fridge., what has happened to him ? I've eaten it"

Well he ate this apple and the result is that there is no apple in the fridge.

3

• "I haven't delivered the package ...." - the result is that he is holding that pachage, or maybe some kind of infom

OR

• "I didn't deliver the package ..." - he just inform that he didn't deliver the package, maybe he hold this package but we don't care about result, we care about if he did it in past or not.