高中英语情态动词课件.ppt
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light has been turned off.
must
2. 表示“坚持”（常用于固定句型：if you must do sth. 如果你非得要做某事）
如果你真的要走，那就悄悄离开。
If you must leave, do it quietly.
• 3.must 做必须讲时，其疑问句的否定回答 用needn't，表示不必，mustn't表示不准 ，禁止。
sБайду номын сангаасconds ago.
A.may
B.might C.must
must
1. must 表示肯定的猜测，译为“一定”， 只能用于肯定句,在疑问句和否定句中表 推测时分别要用can/could和 can't/couldn't。
This must be your pen. He must be doing his homework now. He can't be in the classroom, for the
very uncertain
almost certain
might may could (can) should ought to will must
1.He _____ be at home.
A.may
B.might C.must
2.He _____ be at home, for he
just called me from his home 15
can/could:
2.在疑问句中，用could可表示请 求，语气较委婉。
He asks if he c_o_u_l_d smoke here. — C_o_u_ld_I have the television on?
— Yes, you _c_an_/_m_a.y / No, you _ca_n_’t_/_I’m afraid not
二. We use modal verbs to talk
about:
1. Ability
（能力）
2. Obligation （义务）
3. Certainty （可能性）
4. Permission （允许）
.We also use modal verbs to:
5. Make requests（提出请求） 6. Make suggestions（提出
一.What are modal verbs?
• 情态动词用在行为动词前，表示说话人对 这一动作或状态的态度，看法或主观设想. 但本身词义不完全，不能单独作谓语，只 能和动词原形一起构成谓语。情态动词一 般没有人称和数的变化。 情态动词虽然数 量不多，但用途广泛，主要有下列： can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) must not ，have to.
A.can B.may C.have to D.must
have to
• 1.have to 表示一种客观的需要，即周围的 环境、状况等要求或迫使某人不得不做某 事。
• It's raining outside, so I have to put on my raincoat to go out.
can/could: 4. can never/can’t……too表示 “无论怎样…也不过分”，“越…越
好”You。can’t be too careful 你（过/马ca路r的ef时ul候e再no小ug心h也）不w为h过ile。
crossing the street.
can/be able to区别:
Edison always wondered why hens could hatch (孵) chickens
while he was not able to.
Question: Are the two modal verbs interchangeable (互换) ? If not, why?
• 2. have to 的否定式don't have to，相当于 needn't，表示没有义务或没必要做某事， 意为不必，常用于回答must引导的疑问句 。
• Must I turn in my homework now? • -Yes, you must/ have to. • -No, you needn't /don't have to.
can/could:
3.表示惊异、怀疑、不相信的态度。（主 要用在否定句、疑问句或感叹句中）
Can this be true?
He’s such a nice person that
he _c_a_n_’_t_ commit the crime!
你Ho怎w么ca会n 如yo此u b地e粗so心c！areless!
can表示与生俱来的能力或一种客观可能，而 be able to更加强调通过后天的学习和努力获 得的能力，或者在某个客观的场合和背景下， 能做到的事情。
advisability
necessity
ought to/should
have to
must
Your mother brings you up and takes good care of you, so when she is old, you ___ look after her in return.
建议或意见） 7. Make offers（提供帮助）
1.Ability(能力）——can/could:
1）. can 一般表示与生俱来的能力 或者一种客观可能性,还可以表示 请求和允许 。
Man can not live without air.
Learning English _c_a_n__ be difficult. __C_a_n___ I use your bike?
• -Must I work out the problem tonight?
• -No, you needn't.
• It's my car. You mustn't use it without my permission.
4.Permission(允许） may/might:
must
2. 表示“坚持”（常用于固定句型：if you must do sth. 如果你非得要做某事）
如果你真的要走，那就悄悄离开。
If you must leave, do it quietly.
• 3.must 做必须讲时，其疑问句的否定回答 用needn't，表示不必，mustn't表示不准 ，禁止。
sБайду номын сангаасconds ago.
A.may
B.might C.must
must
1. must 表示肯定的猜测，译为“一定”， 只能用于肯定句,在疑问句和否定句中表 推测时分别要用can/could和 can't/couldn't。
This must be your pen. He must be doing his homework now. He can't be in the classroom, for the
very uncertain
almost certain
might may could (can) should ought to will must
1.He _____ be at home.
A.may
B.might C.must
2.He _____ be at home, for he
just called me from his home 15
can/could:
2.在疑问句中，用could可表示请 求，语气较委婉。
He asks if he c_o_u_l_d smoke here. — C_o_u_ld_I have the television on?
— Yes, you _c_an_/_m_a.y / No, you _ca_n_’t_/_I’m afraid not
二. We use modal verbs to talk
about:
1. Ability
（能力）
2. Obligation （义务）
3. Certainty （可能性）
4. Permission （允许）
.We also use modal verbs to:
5. Make requests（提出请求） 6. Make suggestions（提出
一.What are modal verbs?
• 情态动词用在行为动词前，表示说话人对 这一动作或状态的态度，看法或主观设想. 但本身词义不完全，不能单独作谓语，只 能和动词原形一起构成谓语。情态动词一 般没有人称和数的变化。 情态动词虽然数 量不多，但用途广泛，主要有下列： can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) must not ，have to.
A.can B.may C.have to D.must
have to
• 1.have to 表示一种客观的需要，即周围的 环境、状况等要求或迫使某人不得不做某 事。
• It's raining outside, so I have to put on my raincoat to go out.
can/could: 4. can never/can’t……too表示 “无论怎样…也不过分”，“越…越
好”You。can’t be too careful 你（过/马ca路r的ef时ul候e再no小ug心h也）不w为h过ile。
crossing the street.
can/be able to区别:
Edison always wondered why hens could hatch (孵) chickens
while he was not able to.
Question: Are the two modal verbs interchangeable (互换) ? If not, why?
• 2. have to 的否定式don't have to，相当于 needn't，表示没有义务或没必要做某事， 意为不必，常用于回答must引导的疑问句 。
• Must I turn in my homework now? • -Yes, you must/ have to. • -No, you needn't /don't have to.
can/could:
3.表示惊异、怀疑、不相信的态度。（主 要用在否定句、疑问句或感叹句中）
Can this be true?
He’s such a nice person that
he _c_a_n_’_t_ commit the crime!
你Ho怎w么ca会n 如yo此u b地e粗so心c！areless!
can表示与生俱来的能力或一种客观可能，而 be able to更加强调通过后天的学习和努力获 得的能力，或者在某个客观的场合和背景下， 能做到的事情。
advisability
necessity
ought to/should
have to
must
Your mother brings you up and takes good care of you, so when she is old, you ___ look after her in return.
建议或意见） 7. Make offers（提供帮助）
1.Ability(能力）——can/could:
1）. can 一般表示与生俱来的能力 或者一种客观可能性,还可以表示 请求和允许 。
Man can not live without air.
Learning English _c_a_n__ be difficult. __C_a_n___ I use your bike?
• -Must I work out the problem tonight?
• -No, you needn't.
• It's my car. You mustn't use it without my permission.
4.Permission(允许） may/might: