In this English grammar lesson, you will learn how to use the prepositions of time "by" and "until" In general, "by" + a specific time describes something that must happen before a deadline. "until" + time expression indicates the duration of a continuous action or event up to a specific moment in time. I also explain "till" and when we use it. These prepositions of time are very common and important in English and so, at the end of the video, there is a quiz to test your understanding. Private English lessons & speaking practice: http://goo.gl/8qlf6w Related videos: Prepositions of place: https://www.youtube.com/watch?v=_zhw3BUysUA Conditionals: https://www.youtube.com/watch?v=WPDpe_WuCS8 Playlists: Grammar:    • learn English grammar   Listening practice:    • English listening practice   Vocabulary:    • learn English vocabulary   Andrew, Crown Academy of English http://www.crownacademyenglish.com/ https://twitter.com/Crown_English null All photos, courtesy of FreeDigitalPhotos.net: “Blonde Girl Pointing Away On White Background” - stockimages “Young Courier Guy Moving Boxes” - stockimages “Fit Girl Holding Fruit And Weighing Scale” - stockimages “Job Application” Image courtesy of phasinphoto “Pretty Girl Writing In Her Notebook” - stockimages “Closeup Of Cute Kid Brushing His Teeth” - photostock “Young Kids Sleeping In Classroom” - stockimages “Closed Sign” - artur84 “Excited Girl Holding Currency Notes Fan” - stockimages "Confused Young Woman. Mixed Expression" - stockimages “Businesss Executive Pointing Upwards” - stockimages “Portrait Of A Businesswoman” - stockimages “Smiling Nerd Pointing Away” - stockimages