祈使句是用来表示命令的句式，语气较强，一般用降调:
↘Stand up. 站起来。
Be ↘careful. 小心点。
Close the ↘door. 把门关上。
Leave me ↘alone. 让我一个人呆一会儿。
Don’t make any ↘mistakes. 别出任何差错。
表示鼓励、态度亲切或客气的请求的祈使句或表示委婉命令的祈使句，也可以用升调，这样听起来就会更有礼貌:
Wait a ↗moment. 稍等一下。
Give me a ↗call. 给我打个电话。
Cheer ↗up! 振作起来！
Don’t ↗ worry. 别担心。
Come over ↗here. 过来这儿。¥24
英语升降调的规则:
一、降调:
1、陈述句读降调: He works hard every day.
2、特殊疑问句读降调: Who are you? How do you go to school? Where does he work?
3、感叹句读降调: How clever she is! What a great museum!
二、升调
通常降调用于下列情况：
1、一般疑问句读升调: Are you a doctor? Do you speak English? Would you like some soup?
2、陈述疑问句用升调：You are a policeman?
3、未听清对方的话，要求对方重复一下用升调(以Wh-开头的问句用升调常表示提问的人对所获得的回答没听清楚而要求对方再重复)：What? Who? When? For what? Pardon? What is your name?
4、句子较长，中间划分意群停顿时通常都读升调。
If you like sports， you can be a coach， a sports reporter or a PE teacher.
He is good at football， ping-pong and basketball.
除此之外
1、选择疑问句前升后降: Do you speak English or French? Are you a teacher or a businessman?
2、 反义疑问句前降后升，但把握较大时前后都降: You know it， don't you? It is fine， isn't it?
3、 祈使句表示命令读降调，表示请求用升调: Don't move! Sit down， please. Follow me， please
