情态动词讲解课件
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表示猜测(不可能)
➢7. They (can not/may not) __c_a_n_n_o_t________ still be out, the light is on in the house.
➢8. You (couldn’t/might not) 表示许可 ____c_o_u_ld__n_’t_______ smoke on the bus.
1.It must be my mother. 2.You must be hungry after a walk. 3.There must be a hole in the wall.
have to
“必须,不得不”,意义与must相近。但 must表示的是说话人的主观看法,而have to 则往往强调客观需要。
2.表示推测时,could不是过去式,只是语气更委婉;若是推测已发生的事或过去的情况,用can/could have done
3.can和be able to辨析 can(could)和be able to都可以表示能力,意思上没有区别。但can只有现在式和过去式,而be able to则 有更多的形式。如:
1.May you succeed. 2.May you live happily! 3.May she rest in peace.愿她安息。
1.There is nothing to do, so I may as well go to bed. 2.You may as well tell us now, we’ll find out sooner or later. 3.I suppose we might as well go home.
二.may和 might
情态动词 may/might
用法
例句
表示允许、许可。否定回答一般用must not/mustn’t,表示“禁止、阻止”之意, 但也可以用had better not (最好别)或 may not(不可以),语气较为委婉。
1.May I come in and wait?
2.——May I smoke here? ——No, you mustn’t(或No, you’d better not.)
wish.
表示请求
➢ 3. (could/may) _c_o__u_ld_____you open the window a
bit, please?
表示猜测
➢ 4. He (can/could) __c_o_u_l_d____be from America,
judging by his accent.
三.must和have to
情态动词 must
用法
表示“必须,应该”之意,语气比should, ought to强烈。其否定形式mustn’t表示“不 准,不应该,禁止”等意
在回答带有must的问句时,否定回答常用 needn’t或don’t have to,表示“不必”, 而不用mustn’t
表示有把握的推测,意为“一定、准 是、相必”,只用于肯定句中
please? 4.I wonder if I could just ask you to sign this.
在肯定句中,表示客观可能 1…As a human being, anyone can make a mistake. 性,,常用来说明人或事物 的特征(译为“有时会”)。 2…I’m confident that a solution can be found. 要表达具体某事实际发生的 可能性时,不用can,需用 3…He can be very forgetful sometimes. could,may,might。
1.It can’t be easy caring for a man and a child who are not your own.
2. Can the man over there be our head master?
表示请求和允许。表示 1.Can we turn the air conditioner on? 请求,口语中常用could 2.In soccer, you can’t touch the ball with your hands. 代替can,使语气更委婉。3.Could you have her call me back when she gets home,
After the accident it was a long time before she was able to walk again. The fire was very big, but most people were able to escape from the building.
A. may B. might C. could
D. must
may, might, can, could
表示猜测
➢ 1. They (can/might) ___m__ig_h__t___be away for the
weekend but I’m not sure.
表示许可
➢ 2. You (may/might) __m__a_y_____leave now if you
I’ve always wanted to be able to speak fluent English. Those bags look really heavy, are you sure you’ll be able to carry them on your own?
但是,表示在过去某时的某一场合经过一番努力,终于做成了某事,通常不用could,而用was/were able to来表示。这时,was/were able to相当于managed to do或succeed in doing。如:
➢ 5. (may/can) ____c_a_n_____you swim? 表示能力
➢ 6. Listen, please. You (may not/might not)
____m__a_y__n_o_t______ speak during this exam.
表示不允许
may, might, can, could
1) 情态动词不能表示正在发生或已经发生的事情,只表示期待或估计某事的 发生。
2) 情态动词除ought 和have 外,后面只能接动词原形。 3) 情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。 4) 情态动词没有非谓语形式,即没有不定式,分词,等形式。
Ⅳ 情态动词的用法
情态动词 can/could
➢9. With luck, tomorrow (can/could) ___c_o_u_l_d___be a cooler day. 表示猜测
➢10. You (can/might) ___m_i_g_h_t____ be right, but I’m going back to check it. 表示猜测
1.The film is not interesting. I really must go now. 2.I have to go now, because my mother is in hospital.
must只有一种形式,即现在式与过去式都是 1.I had to work hard when I was your age.
语法 :情态动词
---Modal Verbs
情态动词 Modal Verbs
I 情态动词的定义 情态动词是一种本身有一定的词义,表示说话人的情绪、态度或语气的动词,但
不能单独作谓语,只能和其他动词原形构成谓语。 情态动词数量不多,但用途广泛,主要有: can (could), may (might), must,
例句
1.You must come to school on time. 2.Everybody must obey the law. 3.You mustn’t drive so fast in the street. 4.We mustn’t waste any more time.
1.—Must I come back before ten? —Yes,you must. ----No, you needn’t(No, you don’t have to)
在表示请求、允许时,might比may语气 更委婉些。用May I征询对方许可在文体 上比较正式,在日常用语中,用Can I征 询对方意见更为常见。
1.Might I borrow your pen 2.I wonder if I might speak to your son.
表示可能性的推测,通常用在肯定句和否 定句中,含有“或许”“大概”“可能” 之意;用might代替may时,则语气显得更 加不肯定。 may用于祈使句表示祝愿
一种形式,而have to则涉及各种人称、时态 2.I will have to learn how to use acomputer.
4 惯用形式“cannot …too…”表示“无论怎么……也不(过分)”。如: You cannot be too careful.你越小心越好。 惯用形式“cannot but+ 不定式(不带to)”表示“不得不,只好”。如: I cannot but admire her determination.我不得不钦佩你的决心。
1.A computer ____ think for itself; it must be told what to do.
A. can’t B. couldn’t C. may not D. might not
ቤተ መጻሕፍቲ ባይዱ
1.I thought you ________ like something to read, so I have brought you some books.
惯用句式: “may as well或might(just)as well+动词原 形”意为“最好,满可以,倒不如”,相 当于“had better.
1.It may rain this afternoon. 2.She might come to join us this afternoon. 3.I suppose he might have missed the train.
一can和could
用法
例句
1.表示能力
1.“I don’t think Mike can type.” “Yes, he can.” 2.I can speak fluent English now , but I couldn’t last
year.
表示对现在的动作或 状态进行主观的猜测, 主要用在否定句和疑 问句中。
need, ought to, dare (dared), shall (should), will (would) . II 情态动词的位置 情态动词在句中放在谓语动词之前,谓语动词前若有助动词,则在助动词之前, 疑问句中, 情态动词放在主语之前。 I can see you. Come here. 我能看见你,过来吧。 He must have been away. 他一定走了。 What can I do for you? 你要什么? How dare you treat us like that! 你怎么敢那样对待我们! Ⅲ 情态动词的语法特征
1.Can this be an excuse for not giving them help? 表示惊异、怀疑、不相信 2.This can’t be true. 等态度,主要用在否定句、 3.How can you be so crazy. 疑问句和感叹句中。
特别说明:
1.could用来表示请求时,语气委婉,主要用于疑问句,不能用于肯定句,答语应用can(即:could不能 用于现在时态的简略答语中)。如: ——Could I use your dictionary? ——Yes, you can.(否定回答可用:No, I’m afraid not.或者是you can’t)
➢7. They (can not/may not) __c_a_n_n_o_t________ still be out, the light is on in the house.
➢8. You (couldn’t/might not) 表示许可 ____c_o_u_ld__n_’t_______ smoke on the bus.
1.It must be my mother. 2.You must be hungry after a walk. 3.There must be a hole in the wall.
have to
“必须,不得不”,意义与must相近。但 must表示的是说话人的主观看法,而have to 则往往强调客观需要。
2.表示推测时,could不是过去式,只是语气更委婉;若是推测已发生的事或过去的情况,用can/could have done
3.can和be able to辨析 can(could)和be able to都可以表示能力,意思上没有区别。但can只有现在式和过去式,而be able to则 有更多的形式。如:
1.May you succeed. 2.May you live happily! 3.May she rest in peace.愿她安息。
1.There is nothing to do, so I may as well go to bed. 2.You may as well tell us now, we’ll find out sooner or later. 3.I suppose we might as well go home.
二.may和 might
情态动词 may/might
用法
例句
表示允许、许可。否定回答一般用must not/mustn’t,表示“禁止、阻止”之意, 但也可以用had better not (最好别)或 may not(不可以),语气较为委婉。
1.May I come in and wait?
2.——May I smoke here? ——No, you mustn’t(或No, you’d better not.)
wish.
表示请求
➢ 3. (could/may) _c_o__u_ld_____you open the window a
bit, please?
表示猜测
➢ 4. He (can/could) __c_o_u_l_d____be from America,
judging by his accent.
三.must和have to
情态动词 must
用法
表示“必须,应该”之意,语气比should, ought to强烈。其否定形式mustn’t表示“不 准,不应该,禁止”等意
在回答带有must的问句时,否定回答常用 needn’t或don’t have to,表示“不必”, 而不用mustn’t
表示有把握的推测,意为“一定、准 是、相必”,只用于肯定句中
please? 4.I wonder if I could just ask you to sign this.
在肯定句中,表示客观可能 1…As a human being, anyone can make a mistake. 性,,常用来说明人或事物 的特征(译为“有时会”)。 2…I’m confident that a solution can be found. 要表达具体某事实际发生的 可能性时,不用can,需用 3…He can be very forgetful sometimes. could,may,might。
1.It can’t be easy caring for a man and a child who are not your own.
2. Can the man over there be our head master?
表示请求和允许。表示 1.Can we turn the air conditioner on? 请求,口语中常用could 2.In soccer, you can’t touch the ball with your hands. 代替can,使语气更委婉。3.Could you have her call me back when she gets home,
After the accident it was a long time before she was able to walk again. The fire was very big, but most people were able to escape from the building.
A. may B. might C. could
D. must
may, might, can, could
表示猜测
➢ 1. They (can/might) ___m__ig_h__t___be away for the
weekend but I’m not sure.
表示许可
➢ 2. You (may/might) __m__a_y_____leave now if you
I’ve always wanted to be able to speak fluent English. Those bags look really heavy, are you sure you’ll be able to carry them on your own?
但是,表示在过去某时的某一场合经过一番努力,终于做成了某事,通常不用could,而用was/were able to来表示。这时,was/were able to相当于managed to do或succeed in doing。如:
➢ 5. (may/can) ____c_a_n_____you swim? 表示能力
➢ 6. Listen, please. You (may not/might not)
____m__a_y__n_o_t______ speak during this exam.
表示不允许
may, might, can, could
1) 情态动词不能表示正在发生或已经发生的事情,只表示期待或估计某事的 发生。
2) 情态动词除ought 和have 外,后面只能接动词原形。 3) 情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。 4) 情态动词没有非谓语形式,即没有不定式,分词,等形式。
Ⅳ 情态动词的用法
情态动词 can/could
➢9. With luck, tomorrow (can/could) ___c_o_u_l_d___be a cooler day. 表示猜测
➢10. You (can/might) ___m_i_g_h_t____ be right, but I’m going back to check it. 表示猜测
1.The film is not interesting. I really must go now. 2.I have to go now, because my mother is in hospital.
must只有一种形式,即现在式与过去式都是 1.I had to work hard when I was your age.
语法 :情态动词
---Modal Verbs
情态动词 Modal Verbs
I 情态动词的定义 情态动词是一种本身有一定的词义,表示说话人的情绪、态度或语气的动词,但
不能单独作谓语,只能和其他动词原形构成谓语。 情态动词数量不多,但用途广泛,主要有: can (could), may (might), must,
例句
1.You must come to school on time. 2.Everybody must obey the law. 3.You mustn’t drive so fast in the street. 4.We mustn’t waste any more time.
1.—Must I come back before ten? —Yes,you must. ----No, you needn’t(No, you don’t have to)
在表示请求、允许时,might比may语气 更委婉些。用May I征询对方许可在文体 上比较正式,在日常用语中,用Can I征 询对方意见更为常见。
1.Might I borrow your pen 2.I wonder if I might speak to your son.
表示可能性的推测,通常用在肯定句和否 定句中,含有“或许”“大概”“可能” 之意;用might代替may时,则语气显得更 加不肯定。 may用于祈使句表示祝愿
一种形式,而have to则涉及各种人称、时态 2.I will have to learn how to use acomputer.
4 惯用形式“cannot …too…”表示“无论怎么……也不(过分)”。如: You cannot be too careful.你越小心越好。 惯用形式“cannot but+ 不定式(不带to)”表示“不得不,只好”。如: I cannot but admire her determination.我不得不钦佩你的决心。
1.A computer ____ think for itself; it must be told what to do.
A. can’t B. couldn’t C. may not D. might not
ቤተ መጻሕፍቲ ባይዱ
1.I thought you ________ like something to read, so I have brought you some books.
惯用句式: “may as well或might(just)as well+动词原 形”意为“最好,满可以,倒不如”,相 当于“had better.
1.It may rain this afternoon. 2.She might come to join us this afternoon. 3.I suppose he might have missed the train.
一can和could
用法
例句
1.表示能力
1.“I don’t think Mike can type.” “Yes, he can.” 2.I can speak fluent English now , but I couldn’t last
year.
表示对现在的动作或 状态进行主观的猜测, 主要用在否定句和疑 问句中。
need, ought to, dare (dared), shall (should), will (would) . II 情态动词的位置 情态动词在句中放在谓语动词之前,谓语动词前若有助动词,则在助动词之前, 疑问句中, 情态动词放在主语之前。 I can see you. Come here. 我能看见你,过来吧。 He must have been away. 他一定走了。 What can I do for you? 你要什么? How dare you treat us like that! 你怎么敢那样对待我们! Ⅲ 情态动词的语法特征
1.Can this be an excuse for not giving them help? 表示惊异、怀疑、不相信 2.This can’t be true. 等态度,主要用在否定句、 3.How can you be so crazy. 疑问句和感叹句中。
特别说明:
1.could用来表示请求时,语气委婉,主要用于疑问句,不能用于肯定句,答语应用can(即:could不能 用于现在时态的简略答语中)。如: ——Could I use your dictionary? ——Yes, you can.(否定回答可用:No, I’m afraid not.或者是you can’t)