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.?”. 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. CAN definition: to be able to; have the ability, power, or skill to. See examples of can used in a sentence. (countable) A can is a metal container, usually for holding food or drink. I drink cola from a can. Spaghetti hoops come in a can. The word can is a versatile modal verb in English, commonly used to express ability, permission, possibility, and requests. Its meaning depends on the context, but understanding how to use it effectively will enhance your communication skills. Used to indicate possession of a specified power, right, or privilege. The president can veto congressional bills. Canva is a free-to-use online graphic design tool. Use it to create social media posts, presentations, posters, videos, logos and more. Learning to use can naturally in everyday sentences is one of the quickest ways to sound more confident in English. You will hear it when people talk about ability, ask for help, give permission, or make polite requests at work, in shops, and with friends. Here we will practice the most common patterns and pick the right tone so your meaning stays clear, friendly, and appropriate in different.