祈使句 祈使句表示请求、命令、建议，句子通常不带主语，谓语动词用原形。肯定形式一般以动词原形开头，其否定形式是在谓语动词前加do not或don’t。 A.Don't drive too fast. B.Stop when the light is red.C.Turn right. D.Don't park here.E.Be careful! F. Don't play on the street.