文档介绍：Unit 3 Our Hobbies Topic 1 What hobbies did you use to have?
stamps must be great fun!
1、“must+动词原形”表示对现在所发生的事情的肯定推测,意为“一定,肯定”。如:
    He isn't in his bedroom. He must be in the study room.
    他没在寝室,肯定在书房。
 2、表示否定推测时,则用can't意为“不可能”。如:
    He isn't at home, so he can't watch TV at home.
    他不在家,所以不可能在家看电视。
can also learn a lot about people, places, history and special events from stamps.
learn a lot等于learn much,
了解许多,学到许多。
    learn…from…向……学习;
从……学习……  如:
    We can learn a lot of new things from the .
    我们可以从网上学到许多新东西。
of them are very valuable.
some of…和我们学过的one of…many of…most of…等结构是相同的,只是数量表达上的不同,后可接名词,接可数名词,用复数形式,也可接代词宾格复数。如:
    Many of the students study hard. 许多学生学习很努力。
    The math problem is very easy. Most of us can work it out.
    这道数学题很容易,我们大部分人能做出来。
     如果some of后所接的词是可数名词,则谓语动词用复数;如后接不可数名词,则谓语动词用单数。如:
    Some of the paintings are from Canada. 其中一些画来自加拿大。
    Some of the chicken goes bad. 有一些鸡肉坏了。
not go out and do some outdoor activities?
(1)outdoor activities户外运动。outdoor adj. (在)户外的。如:
    a healthy outdoor life. 有益健康的户外生活。
    (2)go out出去
    ①go out for…为……而出去。如:
    I like going out for a walk with my mother. 我喜欢和妈妈一起出去散步。
    ②go out to do sth. 出去做某事。如:
   Let's go out to play basketball. 我们出去打篮球吧。
I need a change.
(1)change  n.“(通常指有趣的或令人愉快的)转变,变换”。如:
    Let's go out to a restaurant for a change. 我们换换口味,到饭店去吃吧。
    (2)change作为名词还有“零钱”的意思,
    如在商店售货员说Here's your change. 找你零钱。
    (3)作动词还有“变化、改变”之意。如:
    Nobody can change him. 没有人能改变他。
a pet dog.
walk在这里是“牵着(动物)走,遛”的意思。如:
    They often walk their pet pigs in the morning.
    他们经常大清早就遛他们的宠物猪。
interests are changing all the time.
(1)all the time一直,总是。
    (2)interests业余爱好,等于hobbies,是可数名词。如:
    He was a man of wide interests. 他是个有广泛业余爱好的人。
    (3)interest兴趣,关注,趣味,吸引力,常作不可数名词。如:
    There are many places of interest in Beijing. 北京有许多名胜古迹。
    (4)take/have/show an interest in…对……感兴趣;对……表示关注。如:
    Parents always take an in