L56 faster than sound

复习比较级：（第8课基本用法/32课比较状语从句）

比较级er（n.+er than...）;​最高级est（the n.+est of/in）​

例句Yao Ming is the tallest of the three.     

in：环境范围 (neighbor / town / world …) ；of：对象范围 (the three / all the friends / family …)

• Which is the longest river in the world? #世界上最长的河流是哪条?
• This is the finest picture of them all. #这是所有照片中最好的一张。

最高级 + 现在完成时have ever +done

as + adj./adv. + as和...一样；​not so/as + adj. + as 不如​

• He is as old as l am. #肯定句，他和我年龄一样大。
• I'm not as tall as you. #否定句，我不如你高

单词理解

课文理解

语法理解

比较级强调句

no 比较级 than  {和…一样 比较级反义词} = as … as

这个盒子和那个盒子一样轻。

This box is as light as that one.

This box is no heavier than that one.   #比as...as语气更加有强调性

学英语和法语一样难。

Learning English is as hard as learning French.

Learning English is no easier than learning French