精选优质文档-倾情为你奉上 Unit 1 How can we become good learners? 第一节Section A(1a-2d)1.by asking the teacher for help 通过向老师求助(P1-1a)【辨析1】by(介)“通过;靠”表示方式、手段,其后接名词、代词或动词-ing形式。对方式、手段进行提问用how 例:How do you become a top student? -By studying hard.【拓展1】介词by的其他用法:1)by+交通工具,“乘/坐.”bybus乘公共汽车2)by+地点,“在.的旁边;靠近.”bythelake在湖边