Ok. Cas1. fits definition A. and Cas2. fits definition B.; but, that's not the humble point I was trying to make. Sorry. Lemme try again.
jws IHHO provided:
I define the Present Perfect tense as
A. expressing an action that is already COMPLETED at the present time,
OR
B. an action BEGUN earlier and spanning a period to the present time.
The A. part of the definition had me wondering, and still has me wondering what makes the Present Perfect different from the Simple Past, since we can replace the words
Present Perfect with the words
Simple Past:
The Simple Past tense expresses an action that is already COMPLETED at the present time.
(I would drop the last four words in defining the Simple Past, and I would say "an action that HAPPENED in the past (deliberately not using COMPLETED, because that's "aspect".)
Given that the A. definition for the Present Perfect also houses the Simple Past, how would we explain (to students) the use of the Simple Past and the Present Perfect in the sentences below? That's sort of my point.
Cas3. I ate. (finished, over, ended)
Cas4. I have eaten. (finished, over, ended)
Moreover, both 'ate' and 'eaten' are finished, over, ended. I started it and I ended it. The task was completed, if you will allow me to use that term, by me, but my use of the term 'completed' here is different from the one expressed by the conventional definition(s) for the Present Perfect. Herein is where learners, even teachers, come across the fuzzy boundary between the Present Perfect and the Simple Past. "Completed" refers to frames of time. Two timeframes to be exact, as does the Past Perfect.
In short, the word "completed" is ambiguous. In reference to the Perfect, it has nought to do with actions but rather the coming together of two separate points: time frames, if you will, the Past and the Present, as in the making of a perfect circle, and hence the origin of the grammatical term "Perfect". Given this, I wonder if we should modify our definition so as to provide a better understanding of the ambiguous term "completed".
Cas :D
p.s. I apologize in advance for any typos. (It's late.)
