| tense has no bearing on the semantics of modals |
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I'm trying to analyze this sentence, especially in terms of its ramifications.
Which of the following are consistent with that sentence?
No modal verb expresses tense.
No modal verb expresses a relationship in time.
When determining the meaning of a modal (separate from its use in a sentence), tense is irrelevant, i.e., no tense is carried within the modal itself.
When determining the meaning of a modal as used in a particular sentence, tense is irrelevant, i.e., nothing about the modal word determines what tense the sentence is in.
Modals are in effect adverbs, although they have a different grammar.
The meaning of a modal verb contains no information about tense or time.
Modals do not even express "present tense" by default; nor are they ever ambiguous in terms of tense; they simply have no tense whatseoever. They are neither past, nor present, nor future.
Modals are never the "main verb" of a sentence; the non-finite verb which follows the modal is to be considered the "main verb".
A sentence with a modal has no tense whatsoever, not even "present tense" by default; nor is the tense of such a sentence even ambiguous; the sentence simply has no tense at all. "I could read for hours", for example, is not ambiguous as to tense, depending on our reading of it; it simply "has no tense".
"I should have brought my wallet" is a tenseless sentence.
"I should have brought my wallet" is in the present tense because "have" is a present tense form.
"I should have brought my wallet" is in the past tense because "brought" is a past tense form.
CJ