Unit 3 What were you doing when the UFO arrived?
重点语法：过去进行时态
do/does 的过去进行时态形式：（was/were） doing
do/does 的过去进行时态的被动语态：（was/were） being done
过去将来时态的肯定句、否定句和疑问句形式：
肯定句例句：I was walking down the street when a UFO landed.
否定句例句：I wasn't walking down the street when a UFO landed.
一般疑问句例句：Were you walking down the street when a UFO landed?
特殊疑问句例句：What were you doing when a UFO landed?
动词 when 和 while 的选择：when 后加瞬间动词，while 后加延续性动词。
例句：The boy was walking down the street when the UFO landed.
=While the boy was walking down the street， the UFO landed.
感叹句
结构：（1） How + adj. + the + 主语 + 谓语动词
=（2） What + （a/an） + [adj.] + n. + 主语 + 谓语动词
例句：What a beautiful flower [it is]!
=How beautiful the flower is!
What beautiful flowers [they are]!
=How beautiful the flowers are!
重点短语：get out 出去；离开
take off 起飞
run away 逃跑；跑掉
come in 进来
hear about = hear of 听说
take place 发生
as … as 像……一样（eg/ as old as him 像他一样老）
anywhere = everywhere = here and there 任何地方
think about 考虑
think of 认为
get up = get out of the bed 起床
at the doctor's 在诊所
every day 每一天
everyday adj. 日常的
most adj. 大部分
the most 最多的
in space 在太空中
national hero 民族英雄
all over the world = in the world 全世界
Reading Strategy（阅读方法）
The title can be helpful for you to understand a text. （一篇文章的标题可以帮助你理解整篇文章。）It's also a good idea to read the first sentence of each paragraph before you read. （在阅读整篇文章之前，阅读每段的第一句话也是一个很有效的方法。）