新概念英语第一册Lesson125-126课件(共15张PPT)

(共15张PPT)
NCE-1
L125-126
New-1
Must I lose weight
--- Yes, you must!
Must I lose weight
--- No, you needn’t.
--- No, you don’t have to.
Must I wash my face
--- Yes, you must!
Must I wash my face
--- No, you needn’t.
--- No, you don’t have to.
GRAMMAR
MUST
1）must 表示‘必须’
结构：主语 + must + 动词原形
情态动词
后跟动词原形
I must go to the church now.
I must leave at once.
You must finish the work now.
肯定句
否定句
We mustn’t play with fire.
一般疑问句
Must we finish the work tonight
--- Yes, you must.
--- No, you needn’t.
注意must的否定回答
GRAMMAR
HAVE TO
2）have to 表示‘不得不做某事…’
结构：主语 + have/has to + 动词原形
普通动词
后跟动词原形
I have to go to the bathroom.
He has to get up early tomorrow.
I have to buy a gift for him.
肯定句
否定句
I don’t have to buy a gift for him.
一般疑问句
Do you have to buy a gift for him
--- Yes, I do.
--- No, I don’t have to.
--- No, I needn’t.
GRAMMAR
MUST V.S. HAVE TO
1）都表示必要性；后接动词原形
2）must: 指主观想法，带有说话人主观色彩
must: 没有任何时态变化
I can’t go home now because I must finish the cleaning.
GRAMMAR
MUST V.S. HAVE TO
have to: 有一般现在时(have/has to)，一般过去时(had to)，一般将来时(will have to)
3）have to: 强调客观原因导致不得不做某事
Must you go
--- Yes, I have to leave at once.
You don’t have to go to school; it is Sunday today.
Must we clean the room now
Do I have to leave early
--- No, you needn’t.
Need
1）肯定句中：need 为实义动词
2）否定及疑问句中：need 情态动词
I need to have a rest.
Need I clean the table for you
--- No, you needn’t.
New-2
L126 Ex. A&B&C
TEXT
L125