Every now and then, I post on Facebook and Twitter little quick quizzes on grammar and usage. I then provide a link to the correct answer in Jose Carillo’s English Forum, which has already built up a sizeable online learning resource on English since it started in May of 2009.

Surprisingly, this quick quiz that I posted last March 29 have registered 116 responses on Facebook and 52 on Twitter, or over three times the average: “Which negative ‘used to’ construction is correct? ‘They (didn’t used to be, didn’t use to be, used not to be) very close friends.’”

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