(1)、祈使句(表条件)+ or/or else/ otherwise + 主句(表结果)… “否则…，要不然…”
(2)、祈使句(表条件)+ and +主句(表结果)
[例句]
hurry up， or you'll be late for class.
please call me up before you come， otherwise/or else/or we might be out.
你来之前打个电话，否则，我们也许会出去。
think it over and you will find the answer.
give him an inch and he will take a mile. 得寸进尺。
work hard and you will make progress every day. 好好学习，天天向上。
解析：
（1） 句型
（用于警告或忠告）否则，要不然
used to warn or advise sb that sth bad could happen; otherwise
Turn the heat down or it'll burn.
把炉火开小一些，不然就烧焦了。
Open up, or I break in!
把门打开，不然我要砸门了！
《柯林斯高阶英汉双解学习词典》
有时也可以表示为：
She had to have the operation, or she would die.
她必须动手术，要不然就没命了。
otherwise conj. 否则，要不然
〔辨析〕
用于表示否定条件，指如果不做某事，就会发生不好的事，含告诫、威胁之意，语气强于 or。
〔例证〕
Do it now, otherwise you'll be fired.
现在就做，否则就解雇你。
Hands up, otherwise you will be shot.
举起手来，否则就毙了你。
Put your coat on, otherwise you'll catch a cold.
穿上外套，不然你会感冒的。
or conj. 否则，要不然
〔辨析〕
词义同 otherwise，但语气较弱，多用于口语，也可与 else 合用。
〔例证〕
Get away, or (else) I'll call the cops.
滚开，不然我就打电话叫警察了。
Hurry up or (else) we'll be late.
抓紧时间，不然的话我们就要迟到了
Give blood ( if you can )and many lives will be saved.
还可以用简短的形式表示，即省略动词。
Give me one more hour, and I’ll get the work finished.(祈使句)
==One more hour, and I’ll get the work finished.(名词短语)
== If you give me one more hour, I’ll get the work finished.(if条件句)
==If I am given one more hour, I’ll get the work finished.
== Given one more hour, I’ll get the work finished.
More effort, and you will succeed.
Another attempt, and you will get it.
One more minute, and the patient would have bled to death.
（2）、句型：
（表示结果）结果是；那么；就
as a result
Miss another class and you'll fail.
你再缺一次课就会不及格了。
Work hard, and you will succeed.努力工作，那么你就会成功！
= If you work hard, you will succeed.
= If you don't work hard, you won't succeed.
= Unless you work hard, you won't succeed.
= Working hard, you will succeed.
= Work hard, or you won't succeed.
（3）、有关祈使句最可能涉及的考点是：祈使句带主语以及“祈使句+and / then / or+陈述句(一般将来时)”这一句型(祈使句表示条件), 相当于if引导的条件句，整个句子可以改为含if的复合句。。另外，祈使句与反意疑问句一起考查也是高考一大特点。如：
Now stop blowing and you’ll find the glass clear again.
= If you stop blowing, you’ll find the glass clear again.
Work hard, and you’ll pass the exam. 努力点，你会通过考试的。
(1)“祈使句+and +简单句”,and后简单句表示好的结果
Hurry up, and you will catch the bus.
(2)“祈使句+or+简单句” ,or后简单句表不理想的结果
Study hard, or you will fail to pass the exam .
Give me one more hour, and I’ll get the work finished.（祈使句）
==One more hour, and I’ll get the work finished.（名词短语）
== If you give me one more hour, I’ll get the work finished.（if条件句）
==If I am given one more hour, I’ll get the work finished.
== Given one more hour, I’ll get the work finished.
More effort, and you will succeed.
Another attempt, and you will get it.
One more minute, and the patient would have bled to death.
祈使句，+ or + 陈述句
Listen to the teacher carefully in class, or you can’t catch what he is saying.
Let’s keep to the point，or we ______ any decisions.
A will never reach
B have never reached
C never reach
D never reached
小练：
①Help others whenever you can （次要成分忽略不看）______ you will make the world a nicer place to live in.
A. and B. or C. unless D. but
② _____ on the top of the tower and you’ll enjoy the scenery of the whole city.
A. Standing B. Stand
C. To stand D. Stand
③______ and I’ll get the work finished.
A. Have one more hour
B. One more hour=Give me one more hour
C. Given one more hour
D. If I have one more hour
④ Stand over there___ you’ll be able to see it better.
A. or B. while C. but D. and
==If you stand over there, you’ll be able to see it better.
⑤ _____ time, he’ll make a first-class tennis player.
A. Having given B. To give
C. Giving D. Given
⑥ Follow your doctor’s advice. ______ your cough will get worse.
A. or B. and C. then D. so
⑦ ----- English has large vocabulary, hasn’t it?
----- Yes, ____ more words and expressions and you will find it easier to read and communicate.
A. know B. knowing
C. to know D. known
⑧ Stand over there _______you’ll be able to see the oil painting better.
A. but B. till C. and D. or
⑨ _____ their hats into the air, the fans of the winning team let out loud shouts of victory.
A. To throw B. Thrown
C. ThrowingD. Being thrown
⑩If you have a job， yourself to it and finally you’ll succeed．
A．do devote B．don't devote
C．devoting D．not devoting
(keys: ADBDD AACCA)
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