CJ:
On the contrary, I find your comments completely intelligible, Mr. P.
JTT: That's telling!
CJ:
Are we in some kind of warp, speaking a different language from JT?
JTT: No, Jim, you're simply a couple of old prescriptivists who are having a devil of a time shedding long held canards.
CJ:
I think the "past tense" modals might more easily be seen as "conditional tense" modals. (I use "conditional tense" in the manner of the Romance languages, i.e., the "would" tense.)
JTT: In one post, you want to call them one thing then in another, you seek another new term. Obviously, your world has been rocked and you're rushing hither and yon trying to make some sense of it. It's hard to admit that you've been teaching the wrong stuff for, ... forever. But there's no time like the present to start teaching the truth.
CJ:
Just as "would", though a "HISTORICAL past tense", can be 'borrowed' into the present with conditional meaning, so too can "could", "might", and "should".
JTT: And the historical present tense modals "can be 'borrowed' into the past' with conditional meaning. HENCE ----->>>> they are tenseless.
>>>>>>>>>>>>>>
CGEL:
And
should is not used at all with past time meaning.
CJ:
But the versatility of such words does not mean they can never be used as markers of the speaker's sense of speaking from a past point of view, most particularly in subordinate clauses.
JTT: And again, the historical present tense modals do the same thing. You and Mr P are still clinging to the discredited prescriptivist notion called "sequence of tenses OR concord of tenses". That's the mistake that Professor Darling has made in Point 3. You are operating under the same misconception.
Bad rules leave you up the creek without a paddle. (a)