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Need to, have to, must - modals of necessity
source: JamesESL English Lessons (engVid) 2012年2月13日
http://www.engvid.com/ An important grammar lesson on the proper use of need to, have to, and must in English. Learn how to use these modals of necessity like native English speakers. I'll teach you when, how, and why to use them in this lesson. Then take a quiz at http://www.engvid.com/modals-of-neces....
# click for grammars on modals: expressing obligation and necessity