Ed wrote:Since Met56’s understanding is to look at the time and feel it, and you three gentlemen are in almost total agreement, I have to reason that you all have the same power to feel and look at the Time, like a past time as JFK was shot during parade. I wonder if you guys feel and look at it rather clearly or not, in the viewpoint of today? Do you feel the time clearly or not? Can you see the details now, I wonder?
I'm not sure I understand Shun's question, but today I can certainly say "JFK was killed" and not "JFK has been killed".
Superpower indeed!

Ed, I would explain anything I said if there is confusion. It won't be fair as some persons would conclude they didn't understand anything from me after a very long discussion that they want to stop.
As you see, time is invisible, and in simple words, we cannot see or feel time. But a few persons here are
in almost total agreement that they can feel and look at the time, of course including the past time when JFK was shot. I now ask them do they now see the past time clearly? Do they see how many shooters there? I ask this because those who cannot feel and look at the time still have many questions about the shooting.
Ed wrote:......but today I can certainly say "JFK was killed" and not "JFK has been killed". Superpower indeed!

I’m too not so sure what you are pointing at. Do you have a rule for the student to say that "JFK was killed" and not "JFK has been killed"? If you have any rule about any tense, any rule at all, please tell me.
Actually, a past person doesn't necessarily entail Simple Past, and this is why we have many kinds of tenses to express many kinds of time:
Ex: Even today, JFK
lives in all our hearts.
Ex: JFK
has been my hero since I knew about his story.
Now, it is your turn to teach me why we can only say "JFK was killed".
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Ed wrote:From an earlier post by Shun Tang:
Sun wrote:THE EVOLUTION OF A TENSE
It is a long story. Nowadays as we explain the modal verb, people might go so far as to say this:
Quote:
Permission:
(e.g.) Can I smoke in this room?
(e.g.) You can't smoke here, but you can smoke in the garden.
(e.g.) You can meet her tomorrow, but tonight you have to stay home.
Concession:
(e.g.) OK, OK, you win!. You can go there once you've finished.
(e.g.) I surrender, you can do with me what you will.
They honestly think so, to tell the very truth. However, they are wrong. Actually, it is the sentence, not the modal verb, that denotes permission, or concession.
So what happens if we change "can" to "did", for example, while leaving the rest of the sentence as it is?
(a) Can I smoke in this room? vs.
(b) Did I smoke in this room? (as if I didn't know!)
Is it the sentence that matters?
I promise you the sentence does matter. From the very beginning, teachers were wrongly teaching students through the meaning of the sentence. Today we instinctively and subconsciously regard the tense expresses whatever a sentence expresses, though we don't mention the role of the sentence anymore.
You may even deny me and claim that my example in THE EVOLUTION OF A TENSE is not a grammatical or readable structure:
Ex: Tommy (go) to school every day.
So you may see nothing here. Actually, in another forum a person did argue this way, though he was immediately denied by other readers.
Indeed, if a young student habitually forgets to use the tense:
Ex: Tommy go to school every day. (not grammatical)
the dutiful teacher will tell her or him, “Now as you want to describe a habit, you have to use Simple Present, because Simple Present is used to tell habit.” That is how we acquire the instinct of using Simple Present to express habit.
But what I want to point out here is that even without the tense, the teacher can still see a habit -- believe it or not.
Now we may test the examples of Permission or Concession. Please compare the following modified examples with yours in the quotation above.
Permission
(e.g.) I smoke in this room?
(e.g.) You not smoke here, but you smoke in the garden.
(e.g.) You meet her tomorrow, but tonight you have to stay home.
Concession
(e.g.) OK, OK, you win! You go there once you've finished.
(e.g.) I surrender, you do with me what you will.
From all these examples I have got rid of the modal verb CAN, but from the sentences alone we can still clearly see permission and concession. Of course, you may again argue that after the removal of CAN, you can see nothing here from the unreadable, ungrammatical structures.
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You denied the sentence reveals a permission and wrote:(b) Did I smoke in this room? (as if I didn't know!)
Ed, please!! You have already understood it is a permission. As you use DID here, you have to add the brackets to imply "as if you didn't know" whether there was the permission or not. In other words, the brackets have betrayed you.

In other words again, to add difficulty to the example for me, you shouldn't have added the brackets.
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At last, as I will challenge anyone anywhere, tell me a rule to explain English tenses, if there is. So far, there has been no reasonable rule at all. I am not responsible if I don't give the alternative answers. But I have listed all the reasonable answers here in this present thread.
By resurrecting the function of the sentence, to explain a tense is now simple and easy. The only small difficulty is how to argue with the old habit of explaining a tense.
Shun