Today, you'll learn how to use DO, DOES, DID, and DONE in English. Improve your English fluency by learning everything you need to know about the verb TO DO. Feasible comes from faire, the French verb meaning “to do.” Doable and feasible therefore originally meant literally the same thing: “capable of being done.” Do is one of three auxiliary verbs in English: be, do, have. We use do to make negatives (do + not), to make question forms, and to make the verb more emphatic. … DO definition: to perform (an act, duty, role, etc.). See examples of do used in a sentence. 1. To behave or conduct oneself; act: Do as I say and you won't get into trouble. 2. a. To get along; fare: students who do well at school. b. To carry on; manage: I could do without your interference. Find out the differences between an MD and DO, and discover the pros, cons, risks, and benefits, and how it may affect health. When you do something, you take some action or perform an activity or task. Do is often used instead of a more specific verb, to talk about a common action involving a particular thing.