高一英語必修3第1單元導學案
2）用于第二、第三人稱的陳述句中，表示說話人給對方的命令、警告、允諾或威脅
you shall go with me. ( 命令)
you shall have a new dress for your birthday.（允諾）
he shall be punished.（威脅）
should
1)表示勸告或建議，作“應該”講 we should be strict with ourselves.
you should keep your promise.
2) 表示推測，作“可能”、“該”講the roads should be less crowded today.
i should have finished reading it by friday.
3)why / how + should結構表示說話人對謀事不能理解、感到驚異等意思，譯為“竟會”
why should you be so late today?
（你今天怎么來的這么晚？）
i don’t know why you should think that i did it.
（我真不明白你憑什么認為這件事是我干的。）
5. must, may (might) 和can表示“推測”的用法
must 只能用于肯定句，表示可能性很大的一種推測，作“肯定”“一定”講 (1)--- look, someone is coming. who can it be?
--- it may be the headmaster.
---it can’t be him. he has gone to shanghai.
--- then it must be mr zhang. he looks like the headmaster.
(2)--- what can they be talking about?
--- they may / must be talking about the question raised at the meeting.
(3) --- can they have finished the work?
--- yes, they may / must have finished it.
--- no, they can’t have finished the work so soon.
--- then they must have played so much.
may /might 用于肯定句中（可能，或許，大概）；用于否定句中（可能不）。表示可能性較小的一種推測
can 表示推測時，只用于否定句和疑問句中
【合作探究】：i. 單項填空：1. write in simple english in order that everybody ______ understand
you. a. may b. must c. should d. will
2. you _______ miss the lecture, though you ______ have it.
a. mustn’t; needn’t b. needn’t; mustn’t c. mustn’t; mustn’t d. can’t;
needn’t
3. --- better not have the operation right now.
--- ________. a. i mustn’t b. i shouldn’t c. i won’t d. i can’t
4. the train was ten minutes late, so i ______ have run all the way from my house to the station.
a. couldn’t b. shouldn’t c. needn’t d. mustn’t
5. i’m not going simply because i don’t see why i _______.
a. will b. would c. should d. shall
6. --- it must be mr. li who did it.
--- no, it _____ be mr. li.