@KaJe,
Quote:Then I think I'm got something I'd been searching for. It is "could." I'm just wondering why I hadn't known that usage of this word at all. I looked into my (Hungarian) language book, and only two basic usage of "could" is mentioned. 1. It's the past version of "can," 2. it's the conditional version of "can."
Quote:You know many language books, so you can tell me if it is general that only the two mentioned meaning of "could" (conditional and past) is written.
I've moved this second quote from the end of your post to the beginning, KaJe, as they both discuss the same thing.
That is one of the falsehoods that has been spread for a long time, KaJe. In modern English, modal verbs, like 'can' and 'could' are tenseless auxiliary verbs that illustrate speaker emotion or opinion. Both can and could have many more meanings than those two false ones you provided from your Hungarian language book.
Traditional paradigm: Present tense on the left and past tense on the right
can - could
may - might
will - would
shall - should
It is very easy to disprove that modals have tense because no one can make a sentence showing that.
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Let's look at a few examples:
[asterisk *, denotes ungrammatical for the situation. The B sentence of each modal pair as a past tense example of the A sentence]
1A. Peter: I can climb that tree. [Peter climbs the tree]
2A. Peter: *I could climb the tree.*
1B. Jon: I may climb the tree. [Jon climbs the tree]
2B. Jon: *I might climb the tree.*
3A.Mary: I will climb the tree. [Mary climbs the tree]
3B. Mary: *I would climb the tree.*
4A. Joe: I shall climb the tree. [Joe climbs the tree]
4B. Joe: *I should climb the tree.*
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Also, all these modals can be used with past, present and future meanings.
If you would like examples, I will/would be more than willing to provide them // I can/could provide them// I shall [should??] provide them.
Quote:2. it's the conditional version of "can."
That's also false. 'could' is more tentative, but both 'can' and 'could' are used in conditional situations.
If I go with you, can I borrow some money?
If I go with you, could I borrow some money?
Quote:But when I claim, state something, expressing my opinion, it is neither a past or a conditional thing.
You are 100% correct, KaJe. Just from your natural use/knowledge of how English uses these verbs you have been able to determine more than many native speakers. I congratulate you on your focused thinking.
Quote:When I say, "the bag we found could be Joe's," and I think then it too is right, meaning that there are several signs (the contents of the bag or anything else) which make me think rightly that it is Joe's bag, so I could (this could is really conditional could) also say, "I think the bag is Joe's," or "the bag seems to be Joe's," or "in my opinion, the bag is Joe's", [than] then it is a sheer declaration of my opinion.
I addressed this in one of my previous posts. In addition to the ACTUAL modal verbs, [listed above as the historical present and past tenses], which English speakers use to express their social [deontic] opinions and their level of certainty [epistemic] opinions, English also has many
lexical modals.
You've given some examples above, KaJe;
I think/seems/in my opinion.
Let me now give you some more, which you are
almost certainly already aware of.
['almost certainly' states my opinion [it's a synonym of 'must'] that "I 90 to 99% think/believe that you already know of these other
lexical modals".
Quote:Adjectives: like possible, necessary, likely, probable, bound, supposed
Adverbs: like perhaps, possibly, necessarily, probably, certainly, surely
Verbs: like insist, permit, require
Nouns: like possibility, necessity, permission, and similar derivatives
Paraphrased from: The Cambridge Grammar of the English Language pg 173