Must Have（to and Need to怎么用 看完这篇文章你肯定能分清）
1. 在肯定句或疑问句中Must", "have to", and "need to"用来谈论责任、义务和重要行为。
I have no idea about the meeting. I must go to ask Peter.
我对会议一无所知。我必须去问彼得。
（此事的重要性）
She has to communicate with clients from all walks of life.
她必须与各行各业的客户沟通。
（义务、责任）
You need to study more if you want to get good grades.
如果你想取得好成绩，你需要多学习。
（此事的重要性）
"must" and "have to"用来谈论责任，一般我们还要加以区别：
"must"通常用于个人情感意志上觉得有义务；
"have to"则多用于工作和日常生活中的责任。
I must do this right now!
我必须现在就做！
（个人意志）
You must finish the homework before watching TV.
看电视之前你必须先完成家庭作业。
Why must you be mean to me?
你为什么对我这么刻薄？
I have to go to Shanghai every week.
我每周都要去上海。
（工作需要）
When my parents were young they had to work hard.
我父母年轻时不得不努力工作。
You have to finish the work by next Saturday.
你必须在下星期六之前完成这项工作。
注意：must没有过去式，过去时态中一般用“have to”
I had to stay overnight in Beijing.
我不得不在北京过夜。
She had to drive the kids to school.
她得开车送孩子们上学。
Did they have to leave so early?
他们非得这么早就走吗？
"need to"通常表达用于对某人来说重要的一件事，而不是指责任或义务。
She needs to see the dentist tomorrow.
她明天要看牙医。
Does he need to go to work on Sundays?
他星期天需要去上班吗？
Parents need to spend more time with their children.
父母需要花更多的时间和孩子在一起。
2. Must, Have to, and Need to的否定形式意思要注意区别！
"Don"t have to"和"Don"t need to"意思是“不必，不需要”，表示不需要做什么事，区别不大。相对而言，"Don"t need to"和“need to”一样更侧重表达一件具体的事。
"Mustn"t"意思是“不能”，用来表示禁止做某事，与"Don"t have to"和"Don"t need to"意思完全不同。
You mustn"t use your mobile phone while driving.
开车时不要用手机。
Children under 12 mustn"t go into the street by bike.
12岁以下的儿童不得骑自行车上街。
Children mustn"t be left alone in a car.
千万不要把孩子单独留在车里。
You don"t have to arrive before 8.
They didn"t have to work so hard.
We don"t have to work overtime on Saturdays.
She didn"t have to attend the presentation.
In summer vacation millions of students don"t have to get up early.
暑假里，数百万的学生都不必早起。
You don"t need to worry as we all will help with it.
你无需担心，我们都会帮忙的。
She doesn"t need to worry about tuition.
她不必担心学费。
I don"t need to get up early next Monday!
下周一我不用早起！
所以，must的疑问句的回答，不可能是"Mustn"t"，而是"Don"t have to"和"Don"t need to"
Must I pay in advance?
No, you don"t have to/don"t need to.
我必须提前付款吗？
不，你不必。
亲爱的朋友们，通过以上分析和例句说明，你会正确使用Must, Have to, and Need to了吗？
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