1.“by+doing形式”表示方式、方法语法结构by+doing形式，“通过做.的方式”I learn Chinese by listening to tapes。提问方式How do you.？或How can I.?这类句型-How can I turn on the light?-By turning this button.2.拓展：介词by的其他用法：1）by+交通工具，“乘/坐.” by bus2）by+地点，“在.的旁边；靠近.” by the lake3）by+时间，“截止到.；不迟于.” by ten【by短语】 by the way 顺便问一下 by accident= by chance 偶然地 by mistake 错误地 one by one 一个接一个 step by step 一步一步地 little by little 逐渐地by the time 到为止 by oneself 独自地
