Basic English Grammar - Do, Does, Did, Don't, Doesn't, Didn't

source: EnglishLessons4U      2010年8月11日
http://www.engvid.com/ DO is a very simple verb in English, that is used *all the time*. In this simple grammar lesson, I explain how to use it easily and without confusion.

# relevant grammar videos: 1) helping verbs; 2) interrogative (asking questions)