高三复习内容繁重，很多同学天天埋头苦干数理化，忽略了较容易进步的英语。而英语中特殊句式优势比较枯燥难懂的一类。伊顿教育小编接下来给大家一一分析强调句、替代句、省略句与倒装句。来看替代句：

　　1.do/does/did替代动词;

　　2.so和not分别代替肯定和否定的从句.

　　【知识点归纳】

　　1.do/does/did替代动词

　　If that's the case then 100,000,000,000,000,000,000,000 people would weigh as much as the whole Earth

　　does.(= weighs)

　　Difficulties strengthen the mind, as labour does(= strengthen) the body.劳动锻炼身体，困难锻炼意志。

　　A feather falls slower than a stone only because the air holds the feather back more than it does the stone.(替代)

　　2.so和not分别代替肯定和否定的从句(常用动词：think,believe,suppose,imagine,expect,guess,be afraid,fear,hope.etc.)

　　—Is he coming?

　　—I suppose so./So I suppose.

　　否定：I suppose not.