source: English Lessons with Alex 2010年5月17日
http://www.engvid.com/ Not sure what the difference is between "have to," "have got to," and "must"? In this lesson, you will learn how to use each of these very common English phrases effectively and fluently. Take a free quiz on this lesson at http://www.engvid.com/must-have-to-ha...
# click for grammars on modals: expressing obligation and necessity
http://www.engvid.com/ Not sure what the difference is between "have to," "have got to," and "must"? In this lesson, you will learn how to use each of these very common English phrases effectively and fluently. Take a free quiz on this lesson at http://www.engvid.com/must-have-to-ha...