The modal auxiliary verb “can” is most often used to express a person or thing’s ability to do something. Learn the difference between can vs. could and how to use each of them in a sentence, with examples of each word used correctly. Learn about the modal verbs can and could and do the exercises to practise using them. Both can be used to seek permission, but may is more formal. Read on to learn the origin of these words and usages. Native speakers are used to hearing “can you please” when asking someone to complete a task for them, which is why it’s more polite. Interestingly, “can you please” technically means that we’re asking someone whether they are able to do something for us. 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. Get this song on iTunes: This is a fun kids song to practice actions, and the phrase I can.. Do you use “can” and “could” correctly in English? Join me and learn how to use these two important modal verbs, in terms of grammar, vocabulary, and pronunciation. If you’re unsure which one to choose, ask yourself: Are you talking about the present and something definite? Use can. Are you talking about the past, being polite, or discussing a possibility? Use could. Learn the difference between can and could with simple rules, meanings, and everyday examples. Can vs Could: The Basic Difference Can you implies that the person is capable of doing the task, while could you suggests a willingness or possibility of doing it. Overall, both phrases are commonly used in everyday conversation to make requests or ask for assistance.