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Consider this scenarios:

A: Can I do X?
A: Can't I do X?

In both the cases, the B replies with "Yes" to indicate A can do X and with "No" to indicate he cannot.

The 1st one seems to ask for permission while the 2nd one seems to imply a tone of indignation.


Consider another scenario:

A: Can I not do X?
A: Can't I not do X?

Here, B replies with "Yes" to indicate A doesn't have to do X and with "No" to indicate A has to.

Here also, the difference is subtle: A seems to just ask for clarification or permission in the 1st and seems frustrated or even resigned in the 2nd.


My question is, what are the differences between the 2 then?

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    You've really hit the nail on the head with the overtones of indignation often present when the second variant is used. Intonation is controlling; a different tone with the second variant indicates the suggesting of a hitherto unstated and perhaps ingenious course of action - one that the addressee probably hasn't thought of; another tone, perhaps with an 'Oh!', indicates that the speaker has just had a eureka moment. The 'Can't' suggests asking for clarification of rules (rather than for overt permission), or feedback on the drawbacks about the suggested course of action X. Commented Apr 5, 2013 at 7:59
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    english.stackexchange.com/a/96447/15299 Commented Apr 5, 2013 at 17:22
  • Related.
    – tchrist
    Commented Nov 23, 2023 at 18:53

2 Answers 2

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The difference is that, when you add a negation to the verb Can, you don't really change the meaning of the question, which is to simply ask the permission.

So for instance, "Can I do X" is not different from "Can't I do X", so the same answer to either of these questions would have the same meaning.

However, when you add a negation to the verb Do, you change the meaning of the question, because now you're changing the action to which you wanted permission.

So "Can I do X" means something entirely different than "Can I not do X" and the same answer to these questions would therefore have entirely different meanings.

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in simple terms, open and closed answers, Can I do X? implies you want a quick yes or no. Whereas Can't I do X? implies you need further explanation on why you can't. The others are just double negatives as Henrique said.

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    Ah, but if you put a exclamation mark at the end like "Can't i do X!?" (although not thought of as 'good English') would imply you needed a quick yes or no almost overriding your passive stance!
    – Edward
    Commented Apr 8, 2013 at 19:53

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