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used to say that it is possible for somebody/something to do something, or for something to happen. I can run fast. Can you call back tomorrow? He couldn't answer the question. The stadium can be emptied in four minutes. I can't promise anything, but I'll do what I can. Please let us know if you cannot attend the meeting.
The use of can to ask or grant permission has been common since the 19th century and is well established, although some feel may is more appropriate in formal contexts. May is relatively rare in negative constructions (mayn't is not common); cannot and can't are usual in such contexts.
Can is usually used in standard spoken English when asking for permission. It is acceptable in most forms of written English, although in very formal writing, such as official instructions, may is often used instead: Persons under 14 unaccompanied by an adult may not enter.
Define can. can synonyms, can pronunciation, can translation, English dictionary definition of can. to be able to, have the power or skill to: I can take a bus to the airport.
The present tense negative can not is usually contracted to cannot (more formal) or can’t (less formal). The use of can in asking permission is sometimes criticized as being impolite or incorrect by those who favour the more formal alternative “may I...?”.
