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have to的意思接近must，但是must 强调说话人的意愿.
We must remember this 我们必须记住这个。
You must take care of her 你必须照顾她。
而have to表示客观上的必要性，常可译为“不得不”,否定形式表示“不必”
I have to go to work on time我不得不按时上班。
We have to be careful in such matters处理这类事情，我们必须得小心。
He has to do a lot of reading他得看很多书。
“have to”是一个比较特殊的情态动词，初学者很容易跟实义动词“have”混淆，所以切记，必须把“have to”当一个情态动词，不能当两个单词。
另外"have to”有格式变化，根据不同的时态,需要发生不同的结构变化。
为了方便造句和理解“have to”的时态结构变化，下面根据句型和时态分成不同的小句型讲解。
句型1:主语非小三 +have to +动词原型+(宾语)
1) We have to help him 我们不得不帮他
2) You have to sleep 你必须得睡觉句型
句型2:主语非小三 +have to +be+表语
1) My students have to be careful我的学生必须得小心
句型3:主语小三+has to+动词原型+(宾语)
1) She has to take pills 她必须得吃药
2) The doctor has to help him这个医生不得不帮他
句型4:主语小三+has to+ be+表语
1) The girl has to be careful这女孩必须得小心
句型1:主语 had to+动词原型+(宾语)
1)They had to jump into the river last night昨晚他们不得不跳河里。
2)They didn't have to jump into the river last night 昨晚他们不必跳河里。
3)I missed the bus and had to walk home我错过了公车,不得不走路回家。
句型2:主语 had to +be+表语
You had to be careful yesterday昨天你不得不小心。
句型1:主语+will have to+动词原型+(宾语)
1)We will have to take the bus tomorrow 我们明天必须得坐公交车
2) We will not have to take the bus tomorrow我们明天不必坐公交车
3) We will have to help him as much as we can我们将不得不尽量帮他
句型2:主语will have to +be+表语
1) You will have to be careful in the future以后你必须得小心
一般将来时态也可以用be going to+ have to构成,比如:
2) I am going to have to take the bus tomorrow.我明天不得不坐公交车。
3) She is going to have to go home tomorrow.她明天必须得回家
“Have to”一般没有现在进行时态和现在完成时态。.
含有“have to”的疑问句和否定句都要用助动词do构成，比如:
1) Do you have to leave soon?你一定要马上离开吗?
2) Does she have to go with you?她一定要跟你去吗?
3) You don't have to say sorry你不必说对不起。
4) She doesn't have to take the bus 她不必坐公交车
“Have to”也可以用于被动语态，比如:
1) A lot of letters had to be answered有大量的信必须回复
2) The whole thing will have to be done all over again整件事将不得不重做一遍
"Have got to”和have to”意思和用法一样。"Have got to”在口语缩写成've gotta，如:
Have to =have got to，因此，I have to go = I have got to go，再缩写成I've got to go，然后，Got to在口语里会连写成 gotta，最后就变成了:
I've gotta go now =I have to go now我现在得走了。
跟have to”一样，不能把“ought to”当两个单词，必须当成一个情态动词。
另外，注意 ought to通常没有一般疑问句，只有肯定句和否定句，否定句要在ought后面加not。
1) We ought to get up early 我们应该早起
2) We ought to be careful 我们应该小心
3) We ought not to eat too much sugar 我们不应该吃太多糖
4) I ought to go home today 我今天应该回家。
5) You ought to read this book, it is very interesting 你应该读一读这本书，很有趣的
“ought to”和“should”是同义词，用法接近。当然should有一般疑问句，“ought to”则没有，后面学到“should”就明白了。
另外，“ought to”可以构成一些特殊结构或用在被动语态里面:
1) They ought to have stopped at the traffic lights 他们本应在红绿灯前面停车。(实际上没有停车)
2) You ought to have come to the meeting你本应该来开会的。(实际上没有来)注意，“ought to+ have+过去分词”表示虚拟意义。中级语法会讲，这里不详细解释。
3) We ought to be leaving now我们现在该走了（特殊结构)
4) He ought to be isolated 他应该被隔离(被动语态)。
should可以作助动词，也可以作情态动词，作情态动词的时候，就是“应该”的意思，跟ought to差不多。
1） we should get up early=we ought to get up early. 我们应该早起
2 ) we should help the poor people我们应该帮助这些穷人
3） we shouldn't sit in the office all day long我们不应该一整天坐在办公室里面。
当然，“should”有一般疑问句，“ought to”则没有，比如:
4) should we stay here? 我们应该留在这里吗?
5) Should we help the old man? 我们应该帮助这个老人吗?
除了“ought to”没有一般疑问句的情况，should和 ought to几乎没有什么区别，当然 should更常用一些。如:
1) The police should do something about it 警家对这件事应该做点什么。
2) He really shouldn't work so hard他直不应该那么辛苦地工作。
3) You shouldn't drink and drive你不应当酒后驾。
4) You should be famous你应该出名
和 ought to一样，should后面也可以跟完成，进行或者被动形式:
5)You shouldn't have trusted him so readily你不应该这样轻易相信他(should+ have+过去分词，同样表示虚拟)
6)You shouldn't be reading a novel now, you should be reading a textbook .你现在不应该看小说，应该看课本。
7)He should be arrested.他应该被拘捕。
8)The computer system should be reinstalled once in a while. 电脑应该时不时重装系统。
"dare”是一个特别的词语，可以作实义动词，也可以作情态动词。在肯定句里面作实义动词,在疑问句、否定句，条件句里面作情态动词。
Dare在否定句，疑问句，条件句,也就是作情态动词时，“dare”没有人称形式的变化，也就是不管主语是什么人称，都用“dare”，但是有一个过去式“dared"”。
可能是因为“dare”本身也是实义动词，所以“dare”作情态动词用在否定句的时候比较麻烦，有两种表达方式。比如:
I dare not look at her=I don't dare look at her我不敢看她
这里“dare not”跟“don't dare”一样，喜欢用哪个都可以。
She dare not look at me=She doesn't dare look at me她不敢看我。这里，Dare not=doesn't dare
My students dare not ask me questions=my students don't dare ask me questions.我的学生不敢问我问题。这里，Dare not=don't dare
I dared not drink beer last night=l didn't dare drink beer last night昨晚我不敢喝啤酒。这里，dared not=didn't dare
She dared not live in the hotel last night= She didn't dare live in the hotel last night她昨晚不敢住在酒店里面。这里，Dared not=didn't dare
They dared not go home last night =They didn't dare go home last night 他们昨晚不敢回家。这里，Dared not=didn't dare
l dare not hit him.
She dare not look at me.
l dared not hit him last night.
She dared not look at me last night.
l daren’t be careless.
She daren’t be FeiYu’s girlfriend.
“dare”主要用于:
否定句为dare not或者加助动词:doesn't dare ,don't dare, didn't dare
当“dare”出现在否定句的时候,“dare"就是一个情态动词,后面直接跟动词原型。但是,”dare”有过去式"dared"，所以要注意时态问题，另外否定结构比较复杂，注音用助动词“do"构成的另一种否定结构。比如:
1) l dare not(缩与daren't) ask her to marry me我不敢向她求婚。(一般现在时态）
这句话也可以说: l don't dare ask her to marry me.
2)They dared not move他们不敢动。
(一般过去时态)这句话也可以说:they didn't dare move.
3)He doesn't dare say anything他什么也不敢说。
(一般现在时态）这句话也可以说: he dare not say anything.
4)They didn't dare disobey他不敢不服从
“dare"在带有否定意思的句子中也可以作情态动词，直接跟动词原形，而日太身有否定意思了，“dare”不需要变否定格式。比如:
1) No one dared speak of it没有人敢谈及此事。
2) He never dared stay long 他从来不敢待久。
3 ) I hardly dared look at her eyes 我几乎不敢看她的眼睛。
当“dare”出现在疑问句或条件句的时候也属于情态动词，后面跟动词原型。
变成一般疑问句的时候，只要把dare移到主语前面就可以了，当然也可以用助动词do，比如:
1) Dare she look at me?她敢看我吗?
也可以说:Does she dare look at me?
2) Dare I look at her?=Do I dare look at her?我敢看她吗?
3) Did you dare drink beer last night?=dared you drink beer last night?昨晚你敢喝啤酒吗?
4) Dare you interrupt him?=do you dare interrupt him?你敢打扰他吗?
5) How dare you speak to me like that?你怎么敢这样跟我说话?
6) Do you dare tell him the truth?=dare you tell him the truth?你敢告诉她真相吗?
7) I wonder if she dared come home我想知道她是否敢回家。(条件句)
注意，dare在肯定句里面，是一个典型的及物动词，后面不能跟“动词原型”，需要跟“动词不定式短语”作宾语。
比如这个句子“I dare go home alone”就是错的，要改成"I dare to go home alone"
be able to作情态动词的时候一定要当成一个单词，不能理解成三个单词或短语，用法和意思跟can 差不多，大多数时候可以互用:
I am not able to answer your question.(I can't answer your question.)我不能回答你的问题。
Are you able to type?(can you type?)你会打字吗?
但是can不能和be able to一起用，
"I can be able to cook”这样的句子是错的
要么说:I can cook
要么说:I am able to cook
Be able to可以用于更多的时态，can 除了过去式，一般没有其他的变化。
Be able to在不同的时态里面有不同的结构变化，比如:
Be able to要根据主语的人称变成相应的: Is able to 、 am able to 、 are able to、"be able to”的“be跟系动词的“be”用法相同。比如:
1) I am able to repair computers我会修电脑
2) Are you able to repair computers?你会修电脑吗?
3) She is able to swim她会游泳
4) Is she able to swim?她会游泳吗?
5) We are able to catch fish我们可以抓鱼
6) She is not able to cook她不会做饭
Be able to要根据主语的人称变成相应的，Was able to ,were able to。主语是单数用was able to,主语复数用were able to，比如:
1) she was able to drink ten bottles of beer last night 她昨晚能喝十瓶啤酒
2) She wasn't able to find you last night 她昨晚无法找到你。
3) You were able to eat 3 bowls of rice ten years ago.十年前你能吃三碗饭。
Be able to在一般将来时态里面变成:Will be able to
1) I will be able to earn much money我以后可以赚很多钱
2) I will not be able to come to your wedding我不能参加你的婚礼了。
有时候be able to还可以用在现在完成时态，根据主语变成:Has been able to /Have been able to
1) He hasn't been able to leave the house since his accident他出事故以来，一直不能出门。
2) We have been able to earn one million yuan a year 我们已经可以年赚百万了。
need本来是实义动词，也可以作情态动词，但是只有否定格式needn't才能作情态动词，才能跟动词原型构成复合谓语。
当然，在含有否定意义的句子里或者在少数条件句，疑问句里面也可以作情态动词。
表示“不必，没必要”，“needn't"作情态动词没有人称变化，不管主语是单数还是复数，一律用“needn't+动词原型”或“needn't+ be+表语”。比如:
1) I needn't prepare my lessons 我不需要备课。
2) She needn't come here early 她不需要早来这里
3) We needn't be worried我们不必担心
4) You needn't make two copies, one will be ok你不必做两份,一份就可以了。
5) They needn't send me a receipt.他们不必寄收条给我
6) You needn't come to the meeting if you are too busy.你不必来开会，如果你忙的话。
“need”在含有否定意义的句子里面也可以作情态动词，直接跟动词原型构成复合谓语。比如:
1) I need hardly tell you the truth我用不着告诉你真相
2) Nobody need be afraid of catching the disease 谁都不必害怕染上这种病。
3) I don't think you need worry我认为你不必担心。
再次提醒一下，Need必须是否定格式“needn't”或者在否定意义的句子里面出现，才能作情态动词，才能跟动词原型构成复合谓语。
如果是肯定句，need只是一个及物动词，比如这个句子"I need buy a house”是错的，因为这是肯定句,“need"在肯定句里面是一个实义动词, 不能跟动词原形”buy”作宾语，而要变成还没有学的“动词不定式短语”才能作宾语，改成"I need to buy a house”。
另外，”need”在疑问句或条件句里面也可以作情态动词，这里不做详细解释，可以参考牛津词典了解。
“Had better”不能看作是两个单词，必须当作一个情态动词，后面一定要加动词原型。表示“最好”的意思，一般缩写成” 'd better ”。
Had better 没有疑问句，没有时态结构变化，也不受主语人称影响。不管主语是单数还是复数，都是直接“had better+动词原型+(宾语)或be+表语”。
不过,"“had better"有否定格式"had better not”，表示“最好不”的意思。比如:
1) You'd better take a nap after lunch 你最好午饭后睡个午觉。
2) You'd better not talk like that你最好不要那样说话。
3) we'd better stop arguing.我们最好停止争吵。
4) You had better check your homework carefully.你们最好认真检查作业
5) We had better eat less meat我们最好少吃肉
6) We had better not eat too much sugar 我们最好不吃太多糖
7) You had better not meet net friends alone你最好不要一个人去见网友
8) Girls had better not run at night女孩子最好不要夜跑
9) She had better learn English grammar first她最好先学英语语法
10) You'd better be careful你最好小心
11) You'd better not be late你最好不要迟到
Had better后面也可以跟“助动词原型be+现在分词”,表示“最好立即做某事”:
1) I think I'd better be going我想我最好还是走了
2) We'd better be getting our clothes ready.我们最好穿好衣服。
1、have to 造五句话
That girl had to kiss me yesterday night.
I have to brush the bowls.
My girlfriend has to follow her mother.
The doctor beside the car has to introduce that girl under the tree.
You will have to go to school by bus tomorrow.
2、ought to 造三句话
We ought to eat a apple tomorrow morning.
She ought not to hurt the cat.
Your lawyel ought to help you.
3、should 造五句话
You should kiss the girl behind the car.
We shouldn't sit on the chair all day long.
Should you hurt the cat under the tree?
You shouldn't drink water and run.
Should we copy her homework?
4、daren’ t 造五句话
I dare not kiss her face.
She dare not look at the boy.
Her boyfriend dared not kiss her face yesterday night.
That lawyer doesn't dare drink wine.
He never dared speak to you.
5、needn’ t 造五句话
Your accountant needn't be worried.
Your daughter needn't work.
She needn't buy that book to her boyfriend.
I don't think you need eat a apple.
Nobody need be afraid of you.
6、be able to 造五句话
You were able to get that girl's number.
I am able to cook.
She is not able to kiss your face.
The accountant will be able to help you.
She has been able to earn five thousand yuan a month.
7、had better造五句话
You'd better run at night.
The girls had better learn English first.
You had better not be fat.
You had better forget the question.
You had better solve the problems.