祈使句用法详解：表叮嘱
■典型例句
Fasten your seat belt. 系好安全带。
Be sure to get here before nine. 千万要在九点以前到。
Stay in bed for a couple of days. 卧床休息几天。
Take care of yourselves. 你们要注意身体啊！
Look over what you’ve written before handing it to the examiner. 先把你写的看一遍，再交给考官。
Cross the road very carefully. Look both ways, or you might be knocked down. 过马路要非常小心，要看两边，不然会被车撞倒。