4、共同特点无主语,只用动词就可以。表示请求或命令,加上please更客气。Don’t开头否定句,它表禁止没问题。1. _________ smoke here, dad. Smoking has been banned in public places.A. Don’t be B. Don’t C. Not to be D. Be not2. Come on , _________ you’ll be late.A. and B. but C. or D. so3. Our teacher sa
5、id, “________ talk in class.”A. Stop B. Don’t C. Can’t D. No4. _______in bed. It’s bad for your eyes.A. Not to read B. Don’t read C. Don’t to read D. Not read5. _______when you cross the road.A. Don’t care B. Care C. Be careful D. To be carefulExerc