Polite English: Show people you care: "You must be..."

source: Learn English with Rebecca  2015年2月2日
http://www.engvid.com/ "You must be tired." "You must be thrilled." Learn how to use these easy English expressions to connect with others in social or business situations. By being polite and caring, your friends and colleagues will appreciate you more. I will teach you exactly how to use this simple structure in English. You'll also learn some useful vocabulary. Not just an important English lesson, but also a good life lesson!