From the thread "More questions about English tense usage".
Sally Olsen wrote:Could you go back over your posts and explain them more clearly to me?
I guess it is a wide and difficult question and if you try a more specific question, I will meet them more appropriately. I recap the whole thing here and hope I come across your question with luck. I typed the following within a short time and hope you can excuse my typos.
It has been long known to many English learners that we could not tell the difference between Simple Past and Present Perfect.
(Last time I asked the difference here and for a few days there was no response at all. I then had to fill the thread with my own answers. See the thread "Simple Past and Present Perfect" in this forum.) When I was young, however, I didn't believe this. I knew Present Perfect, it was piece of cake. At the very least, I might resort to the 'Golden Rule':
Present Perfect doesn't stay with past time expression.
I only had to believe the difficulty when I had to explain the two tenses to students after their schools, especially impossible when there were no time adverbials in the sentences. I didn't want to cheat because one of them was my kid sister. I then REALLY consulted English grammar books. I was frightened by the fact I found.
In order to tell the two tenses apart, most grammar writers have to hide away the family -- which I call the Past Family -- of past time adverbial IN THE PAST XX YEARS (such as
in the past, in the past year, in the past two months, during the past three decades, over the past four weeks, for the past few years, etc.)
These past time adverbials stay with Present Perfect:
Ex: He has worked here
for the past few years.
(See the thread of "The Past Family" below, which has been pushed down very behind now.)
Intentionally or unintentionally avoiding them, grammarians may easily attain a false conclusion:
"Present Perfect doesn't stay with past time expression". The falsity is based on young students' trust in them. It is neither study nor research at all. Frankly, it is cheating. I then also found out, other than this 'Golden Rule', there was no other objective rule at all in English tenses for teachers to lead the students. I was deeply frustrated.
How about Simple Present? It is actually another nightmare. To explain it, all grammar books will not show you these everyday examples:
Ex1: Recent polls show Bush’s standing with the public has weakened as Americans.....
Ex2: Several groups, including the National Abortion Federation and the Center for Reproductive Rights, plan to challenge the measure in court as soon as it is signed into law.
Ex3: The reality remains that Tung [Hong Kong Governor] will be at the helm until and unless Beijing leaders think otherwise.
Ex4: The 30 new candidates come from around the world, from Australia to Zagreb, Vietnam to Venice, and on the whole follow John Paul's conservative bent.
These examples convey the practical use of the tense. But grammarians have seen there is a trouble: they can't put them in their grammar books. As these very common examples should be no longer said in Simple Present some days, weeks, or years later, they may be in a wrong tense by the time the book publishes. Therefore, grammar writers want to keep them off their books. As a result, grammar writers forcefully help teachers to explain Simple Present by not reporting them whatsoever.
Instead, they carefully select examples that may be
very probably still valid in Simple Present -- as long as the book exists:
Exa: Birds sing.
Exb: The earth revolves around the sun.
Exc: Babies cry a lot.
Exd: Wood floats in water.
Exe: I love you.
Now with these carefully selected examples, they may even claim Simple Present is to tell Habit or Permanency, which can no way corroborate those common examples above. As I have found out later, the confusion between Simple Past and Present Perfect leads to the confusion of Simple Present. A lie is made to support another lie.
OK, how about Future Tense?

My goodness, we don't even know if English has such a tense or not. Actually, most grammarians will hide away the problems of the three tenses -- Simple Present, Present Perfect, and Simple Past -- so that everything seems alright, but they would admit Future Tense is a problem. They have given the most extensive discussions about the tense, and yet they still finally admit they don't know whether we have Future Tense or not. (Please see the thread "Do we have Future Tense?")
At this stage, one may truly ask, do we get anything about any tense at all?
There must have been something very wrong about the explanation about tenses, I said to myself. Since then, I have been keeping an eye on English tenses. In the long run, I found out many rules in this area, nearly half of them have been posted to the thread "Simple Past and Present Perfect", as mentioned above. My ideas were so many and so new that some persons obviously noticed.
Wjserson joked about my many postings and wrote:Shuntang,
I've been following these threads you've created in the past week with great interest, but I have to ask you a question.....Or are you just having fun talking to yourself ?

I wouldn't blame you, it looks like fun.
The reason I ask is simply because I've never seen anyone on this forum someone get so involved with their own ideas. It's almost as if you love reading your own postings.

The reason I had to post many new ideas at once was that the errors in tenses did not come from just one misjudgment. In order to explain these four rules:
(a) Simple Present action indicates a present action (=continuity):
Ex: I live in Hong Kong.
(b) Present Perfect action indicates a past action (=finish):
Ex: I have lived in Japan.
BUT: If we state a Definite Past Time Adverbial, tenses have to be changed:
(c) Present Perfect action indicates a present action (=continuity):
Ex: I have lived in HK since 2000/in the past three years.
(d) Simple Past action indicates a past action (=finish):
Ex: I lived in Japan in 1976/five years ago.
I had to explain also many other points, such as what is "Definite Past Time Adverbial".
As here, because I understand Simple Past comes from Present Perfect, and Present Perfect comes from Simple Present, I have given my promises: Whatever you say to Present Perfect can be said word for word again to either Simple Past or Simple Present. I have kept my promise here, there, and everywhere.
Even so, there was no way to see between Simple Past and Present Perfect if we didn't know the real use of tenses: to tell the time relations between actions. Therefore, as I had to put there also, we had to explain English tenses by the paragraph. (See the thread "Simple Past and Present Perfect".) In order to get some feedback, I challenged any different opinion against any of my rules. Unfortunately, there wasn't then, and there isn't now. While I have denied many of their opinions, they don't want to deny anything about my findings. This renders me speechless, literally.
I didn't post my findings to Future Tense and Progressive Tense, though I have talked about them at length in other forums. I won't put all the eggs in one basket.
Already, Stephen has forgot my posts totally and asked about my promise.
[quote="Stephen Jones in the thread "More questions about English tense usage""]
As I have promised, on one-sentence basis, what you say to Present Perfect can be said word for word again to either Simple Past or Simple Present. Both Simple Past and Present Perfect are "experiential":
Ex: I did/have done my homework on the bus before But now Daddy drives me to school in the Merc, I've got time to do it at home.
Er, what language are we talking about here Shuntang? And while you're at it could you tell us what language you've written it in?[/quote]
This is why I now review one of my posts here, and hope it rings the bell.
I also explained to Larry about the Time of a paragraph of sentences. If at the beginning of a paragraph we mention the time of LAST WEEK for example, we will very likely not repeat the time again, even in the whole paragraph. But all the tenses in the paragraph shall be objectively timed by LAST WEEK:
Simple Past: a finish within LAST WEEK.
Present Perfect: a finish outside LAST WEEK.
Simple Present: a continuity outside LAST WEEK.
Therefore, I argued, we shall not cut up one sentence as all persons do, and ask what is the time of the tense:
Ex: I live in Hong Kong.
== Larry maintains that, according to "The English Verb", tenses are not used to tell Time. Tenses are used to tell Remoteness, which has no objective definitions. As in examples such as this, he argued, we don't see the time of Simple Present.
Finally, Larry had to conclude for our shuttles of discussions (See within this thread, pages before.):
Larry wrote:So far, however, you haven't made a single good argument. Try again. We'll be here.
This time agin,

Larry has to teach readers not to see anything from my postings (See the thread "More questions about English tense usage".):
Larry Latham wrote:Shun Tang does not seem to be asking for help, Sally. If you read a number of his posts in this and other threads, you begin to feel that he is looking for an assembly in which to postulate and then justify his (rather...unorthodox, I'm afraid) views on English grammar with obfuscation.
Larry, why can't you let people see for themselves objectively?
Even unnecessarily, I want to make clear my old confusion above: "There must have been something very wrong about the explanation about tenses, I said to myself". Now I have found out: tenses are used to tell the time relations between sentences. Therefore, it is very wrong for us not to use a paragraph of sentences to explain tenses. On one-sentence basis, the tense doesn't function well. While we thought we were talking about the TENSE, all the time we were actually talking about the SENTENCE, as they did to the following example mentioned in one quotation above:
Ex: I
did/have done my homework on the bus before.
== It is actually the SENTENCE, not the TENSE, that provides the experiential essence.
That is to say, even without the tenses, we can still see the experiential meaning:
Ex: I (do) my homework on the bus before.
Shun