【Key structures】
Must的用法：
Must+原形……(1)＝have to＂不得不，必须＂
　　　　　　 (2)（对现在的）推测
在过去时的句子中，要用have to 来表示＂必须＂
have to……可以有任意时态
She will have to...
She had to...
She has to...
She has/I have had to...
have to……作为实义动词，否定式为don't have to
　will not have to
　didn't have to
对现在的推测：must do
对过去的推测：must have done
在 I think.he thinks...的从句中，一定要用事实说话。

（３）...b...
in one's opinion=I think　"就某人看来＂
　
【Special difficulties】

(a) As:
　As a young girl...(介词)"作为"
　As I learned,...(代词)＂正如＂
　As I am busy==because＂由于＂
　As I was leaving the house...==when＂当...时＂
　Do as you are told. as……方式状语从句的引导词
　I work as...＂作为...工作＂

(b) Dress,Suit,Costume:
　 dress：＂裙子，晚礼服，连衣裙＂（女式）
　 suit：＂套装＂（男式）
　 costume：＂演出服，民族服装，某一年代所穿的服装＂

(c)Grow,Grow up：
　　grow：＂长＂
　　grow up：＂生长，成长＂（指人）

Exercises B. Choose the correct words in the following sentences:
(1)...grow...
(2)...suit...
(3)...costume...
　 fancy-dress-party：化妆舞会
　 hire：雇，租
(4)...dress...
Must:推测；必须＝have to

【Multiple choice questions】

(1)...d...
suggest：暗示
right age：适合的年龄
too...to...：太...以至于不能

(2)...b...
　 She must be...推测
　 exactly:(副词) 确切地　　　exact words

(7)...
　 it is + a.+to do... 形式主语＂某人做某件事情..."
　 It is troublesome to learn English.
　 It is troublesome for us to learn English.
　 (for sb.)为逻辑主语
　 have to do =...is necessary
　 You have to go home.=It is necessary for you to go home.

(8).....
　 appear：扮演
　 seems：看起来，似乎
　 be on show：展览，演出
　 show：显示，给...看
　 be presented：出席 √
　 be present：出席(≠be absent：缺席)

(11)...a...
　 instead of：代替
　 sock：短袜
　 either...or...：或者...或者
　 stocking：长筒袜（女用）
　 neither...nor...：即不...也不...
　
　 in stead of 后面的词，往往是没做或不做的事情

(12)....d...
　　grown up：成年人（的）
　　grow up；成长
　　adolescent：青春期的(13-16岁) adolescent criminal：青春期犯罪
　　teenager：十几岁的人(10-20岁)
　　adult：成年人

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