人教版高一英语必修三 unit2 语法课件(共8张ppt)

• SAM: Does it meanshI o_u_ld_n_’__t____ eat my favourite fried chicken any more?
• MUM: Not exactly, if you love fried chickenne,eydonu’t _________ give it up. Jduosnt’eat thiatvlestos often. You __________w_il_l _ worry too much: a little fried chicken __________ do you good.
• — Must I finish the task right now?
•
—Yes, you must. / Yes, you have to.
•
•
(—No, you needn’t. / No, you don’t have
to. 不，不必。)
•
You mustn’t come here without permission.
• 2. DOCTOR: You are sick because you’ve eaten
poisonous mushrooms. Where did you gheatvtehetom?
• LUCY: I picked them in the forest. I know we _________
and
a
new
sign
he
could
1. ought to／should should 和ought to 都为“应该”的意思，可用于
各种人称。 ought to 的语气稍重一些。 should 表示主语的义务或责任; 或指出—个正确、明智的动作：
• You ought to (should) follow your teacher’s advice.
Grammar Learning
Read through the passage Come and Eat Here and pick out the sentences using moral verbs and translate them into Chinese.
Intention Duty Permission Possibility Guessing Ability
Yong
Hui
getting Duty
away
with
9) He had better do some research. possibility
10) They would become tired very quickly.
•
11) win
PhiesrhcuasptsomwiethrsabdaAicsbkci.oliutynt
• You should take care of your sister．
• They shouldn't allow parking here；the street is too narrow．
多数情况下，ought to 可与should互换使用。 ought t源自文库的反意疑问句用shouldn’t替代。
shop.
•
• 2）have to 的否定形式是don’t have to, 相当于 needn’t。如：
•
They don’t have to buy a computer at
present.
Ought/ought to should/shouldn’t mustn’t needn’t (don’t)have to will can/ c
• 2. must和have to
•
must的用法
•
1）表示主观的义务和必要, 主要用于肯定句和疑
问句, 意思为 “必须……，得……，要……”；由must
引起的疑问句，肯定回答要用must或have to, 否定回
答要用needn’t或don’t have to, 意思是“不必” ；
• must的否定形式mustn’t表示禁止，意思是“不 能，不许”。如：
•
•
have to 的用法 • 1）must表示一种主观的需要，而have to 表示一种
客观的需要，意思是“不得不”。 如：
• I have to attend an important meeting this afternoon.
•
Mother is out, so I have to look after the
• 4) Nothing could be bettepro. ssibility
• 5) Something terrible must have happened if Li Chang
was not coming to eat in his restaurant as Gheueaslwsianygs
• 1) By lunchtime they would all be solpd.ossibility
• 2) By now his restaurant ought to be full of ppeoospsleib. ility • 3) What could have happenepdo?ssibility
• •
did. 6) He could 7) Perhaps
not believe his eyinetse.ntion he should go to the library and
finDduotyut.
•
• •
8) He telling
cpioenuotledpnlentioloitenhsa! ve
• 1. SAM: How can I grow thinner, Mum?
• Mum: Well, yohua_v_e_t_o_____eat food with plenty of fibre that helps you digest besttheoru. lAdnd you _________ stop drinking cola or eating sweet food.
•
eat fresh vegetables. mustn’t DOCTOR: Oh, but you _________