How to Fight SARS
SARS spreads easily among people. But we dont have to be afraid of catching SARS.
What should we do to fight it? First, we should stay at home and open the windows to keep the air fresh and clean. We should change clothes often , wash hands often. and do house cleaning often. Second, we should eat healthy food, drink a lot of water and do more
exercise. At last,?we had better not go to crowed places.
比较have to和must
否定转移
as, which 非限定性定语从句
表原因关系
if, whether引导的名词从句
让步状语从句
与后接名词或代词保持一致
must表示推测
wish的用法
带to 的情态动词
比较may和might
名词性that
what/whatever;that/what; who/whoever
非真实条件句
并列结构作主语时谓语用复数
句子的种类
引导名词性从句的连接词
关系代词that 的用法
比较and和or
比较until和till
牛津实用英语语法 22 than/as+代词+助动词
as, though 引导的倒装句
情态动词的回答方式
判断关系代词与关系副词
表示转折或对比
关系副词引导的定语从句
比较need和dare
指代意义决定谓语的单复数
比较so和 such
特殊的虚拟语气词:should
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