Unit 1 How can we become good learners?知识点 1 Unit 1 How can we become good learners? 语法 一.介词by的用法 1.by意为“通过”，其后常接名词或动词-ing 形式。用来表示“以、通过、用（某种方法或手段）”而达到某种预期的目的，常用来回答how 引导的特殊疑问句。by doing sth 意为“通过做某事” —How does the boy improve his spoken English? —By talking with a foreigner. (1)—How do you learn English so well? — chatting with my uncle in America online. A. By B. With C. In D.And (2)Jackson studied Chinese by __________ tapes. A. listening B. to listen C. listening to D. to listening to 2.by+时间，意为“不迟于，在……之前”I have to go to bed by ten o’clock. 3.by+地点，意为“在……旁”Jim sat down by the window. 4.by+交通工具，意为“乘……”I go to school by bike. 5.由 by构成的固定短语：by the way顺便说一下 by oneself 独自=alone 二.现在完成时的用法 (一)用法: 1.表示过去发生的某一动作或状态对现在造成的影响或结果.常用的标志词有already(“已经”,用于肯定句),yet(“还,已经”，用于否定句和疑问句),ever（“曾经”）,never（“绝不，从不”）,just（“刚刚”）,before（“以前”）,once（“一次”）,twice（“两次”）. I have already eaten the dinner.（说明我现在饱了）。 I have already seen the film. (1)You don’t need to describe her. I ______ her several times. A. meet B. will meet C. have met (2)— Hi,guys.Where are you heading(向……行进) now? — Home.We all our money,so we have to walk home now. A. spend B.spent C. have spent D.are spending Unit 1 How can we become good learners?知识点 2 (3)Have you ever seen him ________? A. ago B. two days ago C. before D. just now 2.表示过去发生的某一动作或状态，一直持续到现在。经常与时间状语for+时间段,since+时间点或一般过去时从句, 如：for five minutes（5 分钟） since 1985（自从1985 年一直到现在）.since he was five years old（自从他是五岁的时候一直到现在...
