Must you make so much noise? It's really disturbing. （你非得弄出这么大动静吗？真的很烦人。）

We must protect the environment for future generations. （我们必须为子孙后代保护环境。）

You must be careful when you cross the road. （你过马路的时候必须要小心。）

Students must listen attentively in class to learn well. （学生们必须在课堂上认真听讲才能学好。）

I must finish this report before the deadline. （我必须在截止日期前完成这份报告。）

She must be very tired after a long day at work. （工作了一整天后，她肯定很累了。）

They must arrive at the airport two hours before the flight. （他们必须在航班起飞前两小时到达机场。）

You mustn't touch the exhibits in the museum. （你绝对不能触摸博物馆里的展品。）

We must save water as it is a precious resource. （我们必须节约用水，因为水是一种宝贵的资源。）

He must have a lot of experience to handle this job. （他一定有很多经验才能胜任这项工作。）

Children must go to bed early to grow up healthily. （孩子们必须早睡才能健康成长。）

You must follow the rules if you want to play the game. （如果你想玩这个游戏，就必须遵守规则。）

I must remember to call my mother later. （我必须记得一会儿给我妈妈打电话。）

The doctor said I must exercise regularly to keep fit. （医生说我必须定期锻炼以保持健康。）

They must be excited about going on vacation next week. （他们一定对下周去度假感到很兴奋。）

We must respect the elders and care for the young. （我们必须尊老爱幼。）

You must show your ID card when entering the building. （进入大楼时你必须出示身份证。）

She must practice the piano every day to improve her skills. （她必须每天练习钢琴以提高她的技巧。）

He must be joking. Don't take his words seriously. （他肯定是在开玩笑。

别把他的话当真。）

We must work hard to achieve our goals. （我们必须努力工作以实现我们的目标。）