@MontereyJack,
Quote:"Once, he could run a mile in under four minutes". You cannot subsitute the present tense"can" for the past tense "could", which presumably you should be able to if in fact the pair had no tenses.
I'm sorry to say, Jack, that that is a completely fatuous argument. You can't substitute "can" there because "can" doesn't function for that
general past condition meaning.
Go back to KaJe's first question on the use of 'can'.
[Colored magnets in a bag; everyone picks one without seeing the color or showing others the color]
A: B might have a red one.
B: D probably has a yellow one.
C: A may have a green one.
D: E could have an orange one.
E: *C can have a blue one.*
[*---* denotes ungrammatical for the situation]
'could' can be used here for a present meaning, Jack, but purported present tense 'can' cannot. You're confused by what you were taught as a youngster. It's modal meaning that determines particular uses; it has nothing to do with tense.
Did you miss this?
Quote:... in English modal auxiliary verbs (can, may, shall, will, etc.) are distinguished from other auxiliary verbs (be, have, do) as well as from ordinary verbs by their lack of tense ... .
...
In English, modals are derived from verbs that did carry tense and take agreement markers during a much earlier stage of the language. ... It is thus important to emphasize to learners that English no longer inflects modals for tense and number.
Perhaps the strongest current support ... for a semantic relationship between present time and remote past time obtains between can and could when could is used to express ability in the remote past:
I can't speak French now, but I could when I was a child.
However, this is a semantic, not a syntactic relationship, and it does not hold for other modal pairs;
The Grammar Book: An ESL/EFL Teacher's Course pg 137-138
Quote:There is no "have" in the sentence, and the verb has no past tense marker. You get that entirely from the past tense "could".
Again, you are confused. That's 'could' operating in its role as a GENERAL PAST ABILITY. Notice how limited this particular use is. It comes, of course, as I've described, from the modal verbs history, from the time when these verbs DID carry tense.
It's only natural that 'could', as the historical past tense form of 'can' has been retained for this this meaning. 'would' has also been retained for some very specialized past tense meanings; in one it functions as a "future in the past" -->
"Bonkstou was elected a senator in 1856. Two years later he would become president."
But 'would' doesn't ever function as the syntactic/grammatical past tense of 'will'. [See below]
Look at it closely. It's not the syntactic/grammatical past tense of 'can'. We know this because,
Jack: I
can make you a Martini, KaJe. [Jack makes a Martini and hands it to KaJe.
Jack: *I could make you a Martini.*
[*-----* denotes ungrammatical for this situation]
=====================
will - would
Jack: Watch me. I will jump over the coffee table. [Jack jumps over the coffee table.]
Jack: *See, I would jump over the coffee table.*
[*------* denotes ungrammatical for the situation]
=============================
shall - should
Jack: Watch me. I shall jump over the coffee table. [Jack jumps over the coffee table.]
Jack: *See, I should jump over the coffee table.*
[*------* denotes ungrammatical for the situation]
========================
may - might
Jack: Watch me. I may jump over the coffee table. [Jack jumps over the coffee table.]
Jack: *See, I might jump over the coffee table.*
[*------* denotes ungrammatical for the situation]
=====================================
Quote:While you admit that "could" is historically the past tense of "can", you somehow ignore the fact that for most people, aside, apparently, from ESL instructors, that's the way it still functions. Dogma somehow seems to preclude attention to reality.
You're still badly confused by the
modal perfect and
modal meaning, among other things.
But you are flat out, dead wrong that native speakers of English use 'can' as the past tense of 'could'.
1.
That plane will have already arrived.
2.
She can't have run a four minute mile. She was a quadriplegic at that time.
Here, above, we have two examples of purported present tense modals being used to describe past situations. They work fine without their purported past tense partners - would & could.
Quote:
The Grammar Book - An ESL/EFL Teacher's Course
...
in fact, in some cases so-called present-tense modals refer to past time:
Jim may have been late last night (past meaning)
Also, in many other cases, so-called past tense modals refer to present or future time:
That could be Sara. (present meaning)
You should see a doctor. (future meaning)
...
In fact, phrasal forms [eg. is able to; is going to; is allowed to; has to; has got to developed in part because the original class of modals lost their connection to time, and the phrasal forms gave English users a way to mark tense and express modality on one and the same verb form.
Ibid