[词性] 二十三、情态动词 2 [ have to ] [ ought to ] [ dare ] [ be able to ] [ needn‘t ] [ had better ]
[ have to ]
have to 得意思接近 must,但是 must 强调说话人的意愿
[例1]:We must remember this. 我们必须记住这个
[例2]:You must take care of her. 你必须照顾她
have to 表达客观上的必要性,表达不得不,否定形式表示 不必
[例1]:I have to go to work on time. 我不得不按时上班
[例2]:We have to be careful in such matters. 处理这类事情,我们必须小心
[例3]:He has to do a lot of reading. 他得看很多书
① 一般现在时态
主语非三单 + have to + 动词原型 + 宾语
[例1]:We have to help him. 我们不得不帮他
[例2]:You have to sleep. 你必须得睡觉
主语非三单 + have to + be + 表语
[例1]:My students have to be careful. 我的学生必须要小心
主语非三单否定句 don't have to
主语三单 + has to + 动词原型 + 宾语
[例1]:She has to take pills. 她必须要吃药
[例2]:The doctor has to help him. 这个医生不得不帮他
主语三单 + has to + be + 表语
[例1]:The girl has to be careful. 这女孩必须得小心
主语三单否定句 doesn't have to
② 一般过去时态
主语 + had to + 动词原型 + 宾语
[例1]:They had to jump into the river last night. 昨晚他们不得不跳河里
[例1]:They didn't have to jump into the river last night. 昨晚他们不必跳河里
[例2]:I missed the last bus and had to walk home. 我错过了公车,不得不走路回家
主语 + had to + be + 表语
[例1]:You had to be careful yesterday. 昨天你不得不小心
③ 一般将来时态
主语 + will + have to + 动词原型 + 宾语
[例1]:We will have to take the bus tomorrow. 我们明天必须得坐公交
[例1]:We will not have to take the bus tomorrow. 我们明天不必坐公交车
[例2]:We will have to help him as much as we can. 我们将不得不尽量帮他
主语 + will + have to + be + 表语
[例1]:You will have to be careful in the future. 以后你必须得小心
注意:一般将来时态,也可以用 be going to + have to 构成
[例1]:I am going to have to take the bus tomorrow. 我明天不得不坐公交车
[例2]:She is going to have to go home tomorrow. 她明天必须得回家
主语:have to 一般没有 现在进行时态 和 现在完成时态
[ have to ] 疑问句 否定句
[例1]:Do you have to leave soon? 你一定要马上离开吗?
[例2]:Does she have to go with you? 她一定要跟你去吗?
[例3]:You don't have to say sorry. 你不必说对不起
[例4]:She doesn't have to take the bus. 她不必坐公交车
注意:过去时态 did.. have to / didn't... have to
将来时态 will... have to / will not... have to
主语:have got to 和 have to 意思和用法一样
have got to 在口语缩写成 've gotta
[例1]:I've gotta go now = I have to go now. 我现在得走了
[ ought to ]
注意:一般 ought to 没有疑问句,只有肯定句和否定句,也没有时态变化
否定句在 ought 后面加 not,ought not to
[例1]:We ought to get up early. 我们应该早起
[例2]:We ought to be careful. 我们应该小心
[例3]:We ought not to eat too much sugar. 我们不应该吃太多糖
[例4]:I ought to go home today. 我今天应该回家
[ should ] 应该
should 可以做助动词,也可以做情态动词,做情态动词得时候,就是 应该 的意思
否定句 should not 疑问句 should 放开头
[例1]:We should get up early = We ought to get up early. 我们应该早起
[例2]:We should help the poor people. 我们应该帮助这些穷人
[例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
[例4]:Should we stay here? 我们应该留在这里吗?
[例5]:Should we help the old man? 我们应该帮助这个老人
[ dare ] 敢
dare 可以做实义动词,也可以做情态动词,在肯定句里面做实义动词,
在否定句,疑问句,条件句里面做情态动词
注意:dare 在肯定句中做实义动词,后面不能跟动词原型,要跟动词不定式短语 做宾语
[例1]:I dare to hit him. 我敢打他
[例2]:I dare not hit him. 我不敢打他
否定句中的 dare 是情态动词,dare not 情态动词,后面跟动词原型 hit,构成复合谓语
注意:dare 做情态动词时没有人称变化,但有过去式 dared
[例1]:I dare not look at her. = I don't dare look at her. 我不敢看她
[例2]:She dare not look at me. = She doesn't dare look at me. 她不敢看我
[例3]:I dared not drink beer last night. = I didn't dare drink beer last night.
昨晚我不敢喝啤酒
注意:dare 在带有 否定意思的句子中 也可以做情态动词
no one nobody 不定代词 没有人
主语 + 谓语 + 宾语,一般现在时态,不定代词做主语
[例1]:No one supports me.
[例2]:Nobody loves me.
[例3]:Nobody dare love me. 否定句,dare 情态动词
[例4]:No one dared speak of it. 没有人敢谈及此事
[例5]:He never dared stay long. 他从来不敢待久
[例6]:I hardly dared look at her eyes. 我几乎不敢看她的眼睛
疑问句,条件句中的 dare 也是情态动词,跟动词原型,变一般疑问句要将 dare 移动到主语前面,也可以用助动词 do
[例1]:Dare she look at me? 她敢看我吗?
[例1]:Does she dare look at me?
[例2]:Dared you drink beer last night? 你昨晚敢喝啤酒吗?
[例2]:Did you dare drink beer last night?
注意:dare 在肯定句中,是及物动词,后面要跟 动词不定式短语 做宾语
[例1]:I dare to go home alone.
[ be able to ] 能,可以
be able to 做情态动词,跟 can 的差不多用法,但 be able to 存在时态用法
[例1]:I am not able to answer your question. 我不能回答你的问题
[例1]:I can't answer your question.
[例2]:Are you able to type? = Can you type? 你会打字吗?
be able to 存在时态变化
① 一般现在时态
is able to am able to are able to
[例1]:I am able to repair computers. 我会修电脑
[例2]:Are you able to repair computers? 你会修电脑吗
[例3]:She is able to swim. 她会游泳
[例4]:Is she able to swim? 她会游泳吗?
[例5]:She is not able to swim. 她不会游泳
② 一般过去时态
was able to were able to
[例1]:She was able to drink ten bottles of beer last night. 她昨晚能喝十瓶啤酒
[例2]:She wasn't able to find you last night. 她昨晚无法找到你
[例3]:You were able to eat 3 bowls of rice ten years ago. 十年前你能吃三碗饭
③ 一般将来时态
will able to
[例1]:I will be able to earn much money. 我以后可以赚很多钱
[例2]:I will not be able to come to your wedding. 我不能参加你的婚礼了
④ 现在完成时态
has been able to have been able to
[例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
[例2]:We have been able to earn one million yuan a year. 我们已经可以年赚百万了
[ needn't ]
need 本来是实义动词,可以做情态动词,只有否定格式 needn't 才能做情态动词,
含有否定意义的句子或者少数的条件句,疑问句里面也可以做情态动词
主语 + needn't + 实义动词 + (宾语)
没有人称要求,没有时态要求
[例1]:I needn't go home.
[例2]:I needn't teach English in the future.
① 用于否定句,表示 不必,没必要,needn't 做情态动词没有人称变化
needn't + 动词原型 needn't + be + 表语
[例1]:I needn't prepare my lessons. 我不需要备课
[例2]:She needn't come here early. 她不需要早来这里
[例3]:We needn't be worried. 我们不必担心
[例4]:They needn't send me a receipt. 他们不必寄收条给我
② 用在带有否定意义的句子中
need 在含有否定意义的句子里面也做情态动词,跟动词原型构成复合谓语
[例1]:I need hardly tell you the truth. 我用不着告诉你真相
[例2]:Nobody need be afraid of catching the disease. 谁都不必害怕染上这种病
[例3]:I don't think you need worry. 我认为你不必担心
注意:如果一定要用 need 表达 我必须买一个房子这样的意思
[例1]:I need to buy a house. need 实义动词,to buy a house动词不定式短语作宾语
[ had better ] 最好
had better 情态动词,后面跟动词原型,表示 最好 ,缩写 'd better
had better 没有疑问句,没有时态结构变化,不受主语人称影响
had better 有否定格式 had better not,表示 最好不 的意思
主语 + had better + 实义动词 + (宾语)
主语 + had better + not + 实义动词 + (宾语)
[例1]:You'd better take a nap after lunch. 你最好午饭后睡个午觉
[例2]:You'd better not talk like that. 你最好不要那样说话
[例3]:We'd better stop arguing. 我们最好停止争吵
[例4]:You had better not meet net friends alone. 你最好不要一个人去见网友
主语 + had better + be + (表语)
主语 + had better + not + be + (表语)
[例1]:You'd better be careful. 你最好小心
[例2]: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
[例1]:I think I'd better be going. 我想我最好还是走了
[例2]:We'd better be getting our clothes ready. 我们最好穿好衣服
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