Unit 6 How long have you been collecting shells?
重点语法：现在完成进行时态
do/does 的现在完成进行时态形式：have/has been doing
do/does 的现在完成进行时态的被动语态：have/has been being done
现在完成进行时态所应用的场合：
①某事从过去发生一直持续到现在都在做
②过去发生的动作对现在造成影响
例：我已上了三年初中。
I have been in Junior School for 3 years.
自从那次他与我谈过心后，我天天都在进步。
I have been making progress since he talked with me that time.
现在完成进行时态的肯定句、否定句和疑问句形式：
肯定句例句：I have been skating for five hours.
否定句例句：I haven't been skating for five hours.
一般疑问句例句：Have you been skating for five hours?
特殊疑问句例句：How long have you been skating?
注意：瞬间动词不能和一段时间连用。
例句：你借这本书已经多长时间了？
How long have you been keeping this book?
重点短语：run out of 用完；用尽
by the way 顺便说说
be interested in doing sth. 对某事感兴趣
more than 比……多
far away 在远处
would like to do sth. = want to do sth. = feel like doing sth. 想要做某事
send sb. sth. = send sth. to sb. 把某物赠送给某人
in fact 实际上
room 房间（用于可数名词）；空间（用于不可数名词）
common → more common → the most common 形容词 common 的原级、比较级和最高级
Reading Strategy（阅读方法）
Let your eyes “scan” the text quickly to find details that you're looking for. （在阅读文章之前，用眼睛“横扫”整篇文章，快速寻找你需要的文章要点。）You can find information quickly without reading the whole text. （这样你就不用细读整篇文章，就能寻找到你需要的一些信息。）