Unit4Iused第一部分知识点分析.doc

Unit4 I used to be afraid of the dark Section A 1. — Mario, you used to be short, didn’t you?马里奥，你以前个子矮，对吗？ — Yes, I did. 是的。 【解析1】 (1) use v.使用→useful adj. 有用的 use up 用完 Studying English is__________(use). (2) use sth to do sth 用某物做某事 We use Internet __________(find) information. (3) used to do sth 过去常常做某事，表示过去做过的事现在已经不做，只用于过去时态。 ◆变成否定句或疑问句时要借助助动词didn’t/did 【拓展】（一） 肯定形式：主语+used to+do… I used to get up at six. (二) 否定形式：主语+ usedn’t /didn’t use +to do … He usedn’t to study hard.= He didn’t use to study hard. （三）疑问形式: ① Used +主语+ to do sth …? 答语： Yes, 主语+used to./ No, 主语+ usedn’t to ②Did + 主语+ use + to do ….? 答语： Yes， 主语+ did./ No, 主语+ didn’t Used he to go to school on foot?= Did he use to go to school on foot? (四) 反意疑问句： 肯定句+ didn’t /usedn’t+ 主语？ He used to be very rich, didn’t he/ usedn’t he? 否定句+ did /used +主语？ He didn’t use to smoke, did /used he? ①My mother used_________（tell）us story when we were young. ( ) ②He used to ____short and ____ short hair when he was young. A. have; be B. be; have C. be; be D. have; have 【用法归纳】 辨析：used to do something.，be used to do something.与be used to doing something. used to “过去常常”(后接动词不定式，表示过去的习惯)。 否定式有两种： did not use to或used not to。 疑问式有两种： Did...use to...?或Used...to do...? 但常用第一种。答语形式与did和used的形式一致。 ◆used to do sth. “过去常常做某事”(而现在已经不做了)， 表示过去习惯性、经常性的动作或状态，和现在对比，暗示现在不做了。 to为不定式符号，后跟动词原形。： I used to go shopping on Saturdays, but now I no longer do so. 过去我经常星期六去购物，但现在我不再那样了。 ◆be used to do something. 表示被动，“.....被用来做……”。 Computers are used to help people do many things. 电脑被用来帮助人们做很多事情。 ◆be used to doing something. “习惯于做某事”。to 在这里是介词，后接名词或动名词。 The teacher is used to going to bed late in the evening. 那个老师习惯于晚睡觉。 【2014山东枣庄 male singer, has long hair, because he ______ long hair. A. used to have B. is used to having C. is used for having D. is used to have 【2014湖北黄冈】42. - Grandpa has changed a lot. - So he has