祈使句 and/or 含有一般将来时的陈述句，该句型中and 表示前后句是条件关系，意思是“那么”，一般表示一种的肯定的结果；or 表示前后句是条件关系，意思是“否则”，一般表示一种否定的不利的结果。祈使句可以转换为if引导的条件状语从句，但这时要去掉连词and/or。
Listen carefully and you’ll umderstand it.
=If you listen carefully, you’ll umderstand it.
认真听，你会听懂的。
Use your head ,and you’ll have an idea.
=If you use your head, you’ll have an idea.
动动脑子，你会想出主意的。
Take more exercise and you’ll become healthy.
=If you take more exercise, you’ll become healthy.
多锻炼，你就会身体健康。
Miss another class and you'll fail.
=If you miss another class,you’ll fall. 你再缺一次课就会不及格了。
Work hard, and you will pass the exams. =If you work hard,you will pass the exams.
努力学习，你就会通过考试。
Come early, and you will see the film star.=If you come early, you will see the film star. 早点来，你就可以看到这位电影明星。
Start early, or you will miss the early bus.
=If you don’t start early, you will miss the early bus.
早点出发，要不然你就赶不上早班车。
Work hard and you will make progress. = If you work hard, you’ll make progress.
加油，你就会成功的。
Hurry up, or we’ll be late for school. 快点，
=If you don’t hurry up, we’ll be late for school. 不然我们就会是上学迟到。
Get up or you’ll be late for school.
= If you don’t get up, you’ll be late for school. 起床吧，否则你上学会迟到了。
Keep to the path or you’ll lose your way. = If you don’t kep to the path, you’ll lose your way. 沿这条小道走，否则就要迷路。
Hurry up, or you will be late. = If you don’t hurry up, you will be late.
赶快啊，否则你会迟到的。
中考、高考以及其他考试命题切入点有三个方面：
1. 考查祈使句句首的动词形式。祈使句句首用动词原形。如：
Just ______ to him, and you will see how clever he is!
A. to listen B. listen C. listened D. listening
【答案与解析】答案选B。因为是祈使句，所以句首要用动词原形。
2. 考查连词and与or的选择与辨析。看前后意思是否一致，若意思一致，则用and；若意思不一致，则用or。如：
Be quick, ______ you’ll miss the early bus.
A. and B. so C. but D. or
【答案与解析】答案选D。因为前后意思不一致，句意为“快点，否则你就赶上不早班车了”。
3. 考查陈述句中的动词时态。原则上用一般将来时。如：
8. Be quiet or you______ the whole house!
A. are waking B. have waken C. will wake D. wake
【答案与解析】答案选C。因其中的陈述句表示将来意义，故用一般将来时。
专题训练
1. Use your head, ______ you’ll have an idea.
A. or B. and C. but D. so
2. ______ the road and you’ll find the building soon.
A. Follow B. Following C. Followed D. to follow
3. ______ your radio down, or you’ll wake the others.
A. Turning B. To turn C. Turned D. Turn
4. ______ a bit closer and you’ll be able to see better.
A. To come B. Coming C. Came D. Come
5. Make sure it is not too hot ______ it’ll burn your mouth.
A. and B. or C. yet D. so
6. Come on, ______ you’ll be late for school.
A. but B. and C. or D. so
7. Keep to the path or you ______ your way.
A. are losing B. have lost C. will lose D. lose
8. Don’t say that again or you______ into trouble.
A. have got B. are getting C. will get D. get
9. Do as the doctor says, ______ your cough will get worse.
A. or B. and C. then D. so
10. Don’t stand there, Tom, _____ you’ll bang your head.
A. or B. and C. but D. so
11. Don’t eat so much, ______ you will become fat.
A. but B. and C. or D. so
12. ______ to the teacher carefully, or you’ll miss what he says.
A. Listening B. To listen C. Listened D. Listen
13. Come home in time, or you mother ______ about you.
A. will worry B. worries C. to worry D. worried
14. Do it carefully, ______ you’ll make a mistake.
A. but B. and C. or D. so
【参考答案】1—5 BADDB 6—10 CCCAA 11—14 CDAC
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