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無人稱和數(shù)的變化, to 后接動(dòng)詞原形。 ? 2) used to 否定式可用 usedn’t to 也可用 didn’t, 用 didn’t時(shí) ,used 還原為 use. ? 3)含有 used to 句子的反意疑問句不常用 usedn’t +主語,而習(xí)慣用 didn’t + 主語。 Test in class: ? 1. when I was a child, I used to ____ playing games. ? A. liking B . like C. liked D. likes Choose the best answer to each sentence. 2. Tom ______ curly hair. ’t have B. isn’t used to have C. didn’t used to have D. didn’t use