In this video, learn how to use "when" and "while" correctly and improve your advanced English grammar. "When" and "While" are two must know words to have in your vocabulary. When is used with a specific past action and while is used with a duration of time. Sometimes a sentence can use "when" or "while" and your choice simply depends on if you want you talk about a specific action or a duration. Other times, the choice depends on the specific sentence structure. By the end of the video, you'll