Air
Air is all around us. It is around us as we walk and play. F
rom the time we were born air is around us on every side. When we sit down, it is around us.
When we go to bed, air is also around us.
We live in air. We can live without food or water for a few days, but we cannot live for more than a few minutes without air. We take in air. When we are working or running we need more air.
When we are asleep, we need less air. We live in air, but we cannot see it. We can only feel it when it is moving. Moving air is called wind. How can we make air move? Here is one way.
Hold an open book in front of your face,close it quickly. What can you feel? What you feel is air.
一般将来时
过去完成时
be to和be going to
“be said+不定式”的七种结构
since的四种用法
现在进行时
一般过去时的用法
“be+过去分词”与“get+过去分词”的区别
英语主动表被动用法归纳
一般现在时的七种用法
过去进行时
比较过去时与现在完成时
关于主动形式表示被动意义
一般现在时代替将来时
何时使用被动语态
get+过去分词表被动
主动语态变被动语态的方法
一般现在时代替过去时
时态一致
现在进行时与一般现在时的区别
用现在进行时表示将来
修饰被动语态的副词一定要放在中间吗
一般现在时的用法
过去进行时与一般过去时的区别
英语不用被动语态几种的情形
两类被动句型的转换
allow什么情况下不能用于被动式
现在进行时代替将来时
通常用于被动结构的动词
时态与时间状语
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