"Can it" in this instance means "Shut up", stop talking - it has nothing to do with ability.

It is very probably a remote reference to canning food to preserve it, the link being that to can something is to close it up tight, to put a lid on it - hence to stop talking, close your mouth.

Answer from DoneWithThis. on Stack Exchange
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Engoo
engoo.com › blog › language tips › "could you" vs "would you": what's the difference?
"Could You" vs "Would You": What's the Difference?
February 18, 2025 - “Would you” is correct, because you are asking if someone will do something and not if they can do it.
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Encyclopedia Britannica
britannica.com › dictionary › eb › qa › would-you-or-could-you
Would you... or Could you... | Britannica Dictionary
Of course, if either of these questions is asked with an angry voice and intonation, the meaning changes. Imagine a frustrated mother or father looking at a teenager and saying: Could you PLEASE turn off the lights in your room? This is not a polite request, but an angry request, and a complaint about something that the teenager hasn't done. And if the teenager wants to complain back, he or she can say: I said I will when I go upstairs.
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Quora
quora.com › Which-is-correct-can-you-or-would-you
Which is correct, can you or would you? - Quora
Answer (1 of 11): They are different… so whether, or not, they are correct depends upon the context. 'Can you' means are you capable of doing something; is it possible. ‘Would you' is conditional; it means are you willing to do something.
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Medium
medium.com › afwp › will-vs-can-c1aa3c5d0e9f
Will vs. Can
October 21, 2019 - Even if you don’t have an ability, you can choose to learn. But will you? Can is not an excuse, but will is. Having the ability to do something is not the same as wanting to do something. Being able to do something doesn’t mean you should do it.
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Englishhelponline
englishhelponline.me › 2010 › 03 › 12 › the-difference-between-words-can-you-could-you-and-would-you
the difference between words: can you, could you and would you | English Help Online's Blog
February 3, 2014 - However, there is a difference in nuance between “could you” and “would you”. The words “could you” focus on the ability to do something, but the words “would you” focus on the willingness to do something.
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Reddit
reddit.com › r/englishlearning › when asking a question, will? would? / can? could?, which is the correct one
r/EnglishLearning on Reddit: When asking a question, will? Would? / can? Could?, which is the correct one
September 29, 2021 -

I have puzzled over when should I adopt will/would or can/could.

Apart from conditional scenario, simply like:

Can? Could? I borrow a book from you

Or would you mind to borrow me a Hooke? / will you borrow me a book?

Please help me to solve this puzzle! Thanks

Top answer
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"Can/could" and "will/would" can generally be used interchangeably in questions like that, BUT "could" and "would" generally sound more formal and polite. In English, we often use past tense ("could" and "would" are technically past tense) to sound more polite (in these contexts, the past tense doesn't actually refer to the past): "Can I borrow a book from you?" "Could I borrow a book from you?" - This means the same as the above, but it's more formal/polite. In your second example, you need to use the verb "lend" not "borrow" (you borrow something, but someone else lends it to you): "Will you lend me a book?" "Would you lend me a book?" - This means the same as the above, but it's more formal/polite. Note that "could" can have a different meaning though - it can actually refer to the past. This wouldn't really work in your example, but note the following sentence: "Could you read when you were three years old?" - Here, "could" refers to the past. It means the same as: "Were you able to read when you were three years old?" And note that "would" can also have a different meaning - it can refer to the present or future, usually in a conditional sense (i.e., it depends on something else happening): "What would you do if you won the lottery?"
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Should’, ‘would’ and ‘could’ are auxiliary verbs that can sometimes get confusing. They are the past tense of ‘shall’, ‘will’ and ‘can’ but are also used in other situations. ‘Should’ can be used: To express something that is probable Examples: “John should be here by 2:00 PM.” “He should be bringing Jennifer with him. To ask questions Examples: “Should we turn left at this street?” “Shouldn’t you be getting ready for work?” To show obligation, give recommendation or even an opinion Examples: “You should stop eating fast food.” “You should go for walks more often.” “We should go to the park tomorrow.” “He should go to the pharmacy first thing in the morning.” Want to have the amazing feeling of traveling the world from your desk? Learn English with teachers and students from all over the world in our online virtual real live classes. Make the first step today! ‘Would’ can be used: To ask ‘who’, ‘what’, ‘where’, ‘when’, ‘why’ or ‘how’ (not always, but often) Examples: “How would you do that?” “What would you do if…” “When would we have time to do that?” “Who would want to wait in that line?” To make a polite request Examples: “Would you like any tea?” “Would you like anything else?” In hypothetical situations Examples: “If I had a lot of money I would like to own a farm one day.” “I would love to buy a boat one day.” To ask questions Examples: “Would you like fries or salad?” “Would you like to join us tonight?” ‘Could’ can be used: To suggest a possibility Examples: “Whose journal is this? It could be Nelly’s journal.” “Could ‘A’ be the answer? It’s definitely not ‘B’ or ‘D.’” To make a polite request Examples: “Could you please move this box?” “Could you please pass that paper?” Using the word ‘could’ to respond to the requests we made in the last example would suggest that you could do it, but you might not really want to. If you agree to the request, then you use the word ‘can’. Examples: “Could you please move this box?” “I could, but I am really busy right now.” “Could you please pass that paper.” “Sure, I can.”
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Reddit
reddit.com › r/englishlearning › what does "you'll can me" mean?
What does "You'll can me" mean? : r/EnglishLearning
October 16, 2023 - Very rare you will practically never use this or hear fhis · Evil_Weevill · • 2y ago · can here as in garbage can. This is an idiom meaning to fire someone from their job. Basically throwing them out like garbage. "I got canned" = "I was fired from my job" TheresNoHurry ·
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The short and simple answer is that they are varying degrees of uncertainty.

If you say The cat is dead you are 100% sure the cat is dead, otherwise you wouldn't say it. If you say the cat might/may/could be dead you are not 100% certain. If you say the cat can be dead it is a possibility, but you don't know if it actually true or not. If you say the cat must be dead then you are voicing a conclusion, but again you don't know if it true or not.

Viewing modality as a matter formality is simplistic. More formality usually correlates to less directness, and less directness manifests in speech as more uncertainty expressed through modal verbs, but this is a side-effect of a behaviour issue more than a linguistic one.

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From my experience:

  • "You can" tends to mean that someone is able to do something that they probably thought they wouldn't be able to. / ability / permission / certainty / possibility

  • "You could" means that although it is technically possible to do something, you aren't likely to. Formal suggestion / formal possibility / past ability

  • "You may" is similar to "You can," but is more formal. / permission / formal suggestion / weak degree of certainty

  • "You might" implies that the question was not if it was possible or not, but rather if they would. Also, it often means that it is most likely that you will not do the action but that it is a possibility. / suggestion / weak degree of certainty / formal suggestion

Although these differences are small, they may ;) help you seem more like a native speaker. Still, these differences are small and you can often use any of the words.

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PELA
portlandenglish.edu › home › what’s the difference between can and will?
What's the Difference Between Can and Will? - PELA
January 18, 2023 - As covered in our English classes, can/can’t indicate ability while will/won’t indicate willingness. What’s the difference between ability and willingness? Ability means you have the skills.
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Quora
quora.com › What-is-the-difference-between-“can-you”-and-“could-you”
What is the difference between “can you” and “could you”? ...
Answer (1 of 21): Neither of these phrases is used in asking for permission. “Can you” is asking one of the following . . . * For a favor from the other person. Can you pick me up at the airport on Wednesday? * Whether the other person has the ability to do something. Can you drive a stick sh...
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Reddit
reddit.com › r/englishlearning › isn't it supposed to be "you can"?
r/EnglishLearning on Reddit: Isn't it supposed to be "you can"?
June 20, 2024 - It didn't sound grammatical to me at first, but it works if you think of the "so" in "so can you" as meaning something like "likewise" with the stress on the "so", and the "so" in "so you can, too" as "therefor" with the stress on the "you" ... Important to note: The “too” in “you can too” is not optional. Omitting that word at the end of the sentence makes it incomplete and people will expect you to continue speaking to finish it.
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Stack Exchange
english.stackexchange.com › questions › 607511 › what-is-the-difference-between-can-could-and-would-you-mind-in-asking-que
meaning - What is the difference between 'can', 'could' and 'would you mind' in asking questions? - English Language & Usage Stack Exchange
"Can you?" and "Could you?" are still fairly polite. Obviously, there are nuances that are difficult to summarize. For example, if you're at McDonald's arguably the most polite way to order would be, "Could I get a quarter pounder with cheese?" If you asked, "Would you mind giving me a quarter pounder with cheese?" it might come off as almost sarcastic because it implies what your asking for could be burdensome to the other person.