知识点1:must 和 have to的用法区别
[1]have,区别,相关知识点“there+ be”结构与have的区别have表示所有关系，前有主语，意为“归主语所有”；“there +be”则表示“存在” 的状态，即“某地有某物/某人”。I have a computer.我有一台电脑。There is a radio on the desk.桌子上有一台收音机。There are three children in my family。我家有三个孩
1. must 侧重于个人意志和主观上的必要。have to 侧重于客观上的必要，可用于现在时、过去时和将来时。例如：
I know I must study hard. 我知道我必须努力学习。
My brother was very ill, so I had to call the doctor in the mid-night.
我弟弟病得厉害， 我只得半夜里把医生请来。
I haven't got any money with me, so I'll have to borrow some from my friend.
[2]friend单词记忆法◆记忆方法一：分析：f—疯，ri—日子拼音，end—结束 记忆方法：和朋友们一起疯玩的日子结束了；◆记忆方法二：联想方式： fri-（ 访日 ）；end-（最后 ）记忆方法： 朋友访日，最后定居。
我身上没带钱，只好向朋友借点了。
He said they must work hard.他说他们必须努力工作。
2. have to可以用于多种时态；而must只用于一般现在或将来。例如：
The composition is due to hand in this morning, so I had to finish it last night.
作文今天早晨到期，因此我不得不昨天晚上完成。
知识点2:情态动词must与have to的用法
[3]情态动词,动词,相关知识点知识点1:情态动词后必须接动词原形吗情态动词后必须接动词原形吗有网友问：情态动词后必须接动词原形吗？为什么有的书上又说情态动词后接动词完成式呢？现回答如下：▲情态动词后必须接动词原形，不能接带to不定式或动名词等。如：我们应当学讲流利正确的英语。误：We must to learn to speak English fluently and correctly. 误：We mu
六、关于 must 的简短回答：
-Must I clean the dining room at once? 我必须马上打扫膳厅吗?
-Yes, you must. 是的。
[4]must单词记忆法◆记忆方法一：联想方式：mu-（沐）＋st-（身体）算命大师算命前，沐（mu）身体是必须的工作。◆记忆方法二：联想方式：mu-（沐）＋st-（身体）记忆方法：算命大师算命前，沐（mu）身体是必须的工作。
-No, you needn't. / No, you don't have to. 不必马上打扫。
have to 的用法
一、have to 表客观的需要和义务，must 表主观的认识。例如：
I missed the train, so I had to take a taxi. 我没搭上火车，所以我只得打的。(客观上需要打的)
I must study hard. 我必须努力学习。(主观上认为应该努力学习)
二、在疑问句和否定句中，have to 多用助动词 do 构成，must 则直接提前或加not。例如：
[5]否定句,疑问句,相关知识点there be的否定句与疑问句Is there room for me in the car? 车子里还有我坐的地方吗?Are there any letters for me? 有我的信吗?若谓语中包括有助动词或情态动词，通常将助动词或情态动词移至句首构成疑问式：Has there been an accident? 出事了吗?Have there been any new
Did he have to do it? = Must he do it? 他得做那件事吗?
而且在否定句中，have to 表不需要，must 表不允许：
You don't have to go there. 你不需要去那儿。
You mustn't go there? 你不可去那儿。
知识点3:快速掌握 must 与 have to 用法区别
He only saw her in the evening, having to be away all day. 他整天得外出，只能晚上见她。
I regret to have to trouble you again. 我很抱歉不得不再麻烦你一次。
四、must 与 have to 在否定式中意义不同
[6]have,否定式,相关知识点如果“have”作“有”讲,也可以在它后面加not构成否定式,其形式与have got的否定式相同。○3述句(主语+谓语+其他)在口语中可以直接表示疑问,表示惊讶或明知故问。如：That’s your boss?（那就是你的老板？！）④陈述句一般情况下应使用正常的语序,即：主语+谓语+其他。但是有时会倒装,详见“倒装句”。⑤ 有的从句一律使用陈述句语序,即在连接词后采用“主语+
must 的否定式 mustn’t 意为“一定不要”、“不允许”；而 have to 的否定式 don’t have to 意为“不必”(=needn’t)。比较：
[7]have单词记忆法◆记忆方法一：联想方式：ha（哈）；ve（唯一）哈，唯一的一个苹果我吃了。◆记忆方法二：联想方式：ha（哈）；ve（唯一）记忆方法：哈，唯一的一个苹果我吃了。◆记忆方法三：词根词缀记忆法：have v 有,hau=possess，表示“拥有”
have to相关单词意思与记忆法：
have to单词意思解释释义：
modalv.不得不；必须
must相关单词意思与记忆法：
must单词意思解释释义：
n. 必须, 未发酵葡萄汁, 绝对必要的事物aux. 必须【医】 鲜葡萄汁(未发酵的葡萄汁)
must单词记忆法：
◆记忆方法一：
联想方式：mu-（沐）＋st-（身体）
算命大师算命前，沐（mu）身体是必须的工作。
◆记忆方法二：
联想方式：mu-（沐）＋st-（身体）
记忆方法：算命大师算命前，沐（mu）身体是必须的工作。
have to单词相关例句：
To make your life a sound structrure that will serve others and fulfil your own potential, you have to remember that strength, however massive , can't endure unless it has the interlocking supprt of others. Go it alone and you'll inevitably tumble.——Zichler Edward, Admerican writer 要使你的生活成为有益于他人同时又能发挥你自己的潜力的牢固的建筑，你必须记住，除非与他人的支持联系在一起，否则无论多么大的力量都难以持久，单枪匹马必将一事无成。美国作家 爱德华.Z.
Co-operation is doing with a smile what you have to do anyhow. 所谓合作，就是面带笑容去做非做不可的事。
If we cannot get what we like, we have to like what we can get. 随遇而安。
You have to believe in yourself.That's the secret of success. 人必须相信自已,这是成功的秘诀.
You have to try to save money for emergency.
你应该试着存点钱以备不时之需。
If you want to hit the target, you will have to concentrate and focus.
如果你想射中靶子，你必须做到集中精神和专注。
We don't have to go to school on Sunday. Let's play!
周日不上学，咱们去玩儿吧！
Sorry I can't go out with you, I have to study for the exam.
抱歉我不能跟你出去玩，我还要准备考试呢。
Why do I have to go through these bureaucratic processes just to buy a house?
为什么我要经过那么多官僚程序才能买一套房子啊？
I'm wearing my raincoat, so I don't have to worry about the rain.
我穿了雨衣，这样就不怕雨淋了。
must单词相关例句：
We must accept finite disappointment, but we must never lose infinite hope. ( Martin Luther King, Jr.)—— 我们必须接受失望，因为它是有限的，但千万不可失去希望，因为它是无穷的。（马丁。路德。金）
The world can be changed by man's endeavor, and that this endeavor can lead to something new and better .No man can sever the bonds that unite him to his society simply by averting his eyes . He must ever be receptive and sensitive to the new ; and have sufficient courage and skill to novel facts and to deal with them . (Franklin Roosevelt , American President )——人经过努力可以改变世界，这种努力可以使人类达到新的、更美好的境界。没有人仅凭闭目、不看社会现实就能割断自己与社会的联系。他必须敏感，随时准备接受新鲜事物；他必须有勇气与能力去面对新的事实，解决新问题。(美国总统 罗斯福建. F.)
He that would command must serve. 欲做先生，先做学生。
They who cannot do as they would, must do as they can. 不能为所欲为者，也当尽力而为之。
Errors, like straws, upon the surface flow; he who would search for pearls must dive below. 错误像稻草，漂浮在水面。欲觅珍珠者，须往水下潜。
He who would search for pearls must dive below(or deep). 欲寻珍珠，须潜水下。
Wherever in the world a people knows desperate want, there must appear at least the spark of hope, the hope of progress--or there will surely rise at last the flames of conflict.——Dwight Eisenhower,Commander in chief of the Allied forces in the second World War 任何地方，一个民族只要知道自己迫切需要什么，那里就会出现希望的火花，出现进步的希望，换句话说，最后必定会燃起抗争的火焰。第二次世界大战中盟军最高司令 艾森豪威尔，D.
He that will have his farm full, must keep an old cock and a young bull. 要使农家富又足，必须养鸡又养牛。
Disease, enemy, and debt --these three must be cut off as soon as they begin to grow. 病，仇与债这三者，一露苗头就砍掉。
As you make your bed so you must lie on it. 自食其果。
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