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新概念英语第一册语法知识点之情态动词的使用
can, must, may, might, need
情态动词can(能够)， must(必须)， may(可以)
结构：主语+can/must/may+动词原型
He can make the tea.
Sally can air the room.
We can speak English.
★变疑问句将情态动词移到句首
Can he make the tea?
Can Sally air the room?
Can we speak English?
★变否定句在情态动词后面加not
He cannot make the tea.
Sally cannot air the room.
We cannot speak English.
★肯定回答及否定回答
Yes, he can. No, he cannot.
Yes, she can. No, she cannot.
Yes, we can. No, we cannot.
★特殊疑问句：
What can you do?
(必背)
注意：情态动词的句子没有第三人称单数的变化，不要在情态动词或动词后面加S。
1)Must/have to的区别
must 表示必须，是主观上觉得应该做，have to是不得不，是由于客观条件逼迫的必要要做
must 只能用在表示现在和将来的句子里，而have to do可以用在任何时态
2)must, may, might表示猜测：
must do 表示对现在事实的猜测
must have done表示对过去事实的猜测
must have been doing 表示对过去正在进行的事实的猜测
may/might do, may/might have done表示没有任何事实依据的猜测，might的可能性更小。
can’t/couldn’t 表示不可能
新概念第一册语法讲解：一般现在时
1、含有be动词的句子
He is a teacher.
The girl is very beautiful.
Tim and Jack are students.
★变疑问句将be动词移到句首
Is he a teacher?
Is the girl very beautiful?
Are Tim and Jack students?
★变否定句在be动词后面加not
He is not a teacher.
The girl is not very beautiful.
Tim and Jack are not students.
★肯定回答及否定回答
Yes, he is. / No, he is not.
Yes, she is. / No, she is not.
Yes, they are. / No, they are not.
2、不含有be动词的句子，即含有一般动词的句子。
(1)第三人称单数及单数名词
He likes books.
She likes him.
The dog likes bones.
★变疑问句在句首加does, 动词变为原型
Does he like books?
Does she like him?
Does the dog like bones?
★变否定句在主语及动词之间加doesn't, 动词变为原型，原句中的动词不再有第三人称变化。
He doesn't like books.
She doesn't like him.
The dog doesn't like bones.
★肯定回答及否定回答：
Yes, he does. / No, he doesn't.
Yes, she does. / No, she doesn't
Yes, it does. / No, it doesn't.
注意：第三人称单数形式一般在动词后面加S，不要和名词复数混淆，变否定句或疑问句时名词复数没有任何变化。
(2)其他人称及复数名词
I want to have a bath.
We have some meat.
The students like smart teachers.
★变疑问句在句首加do
Do you want to have a bath?
Do we have any meat?
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2024新概念英语第一册语法知识点之情态动词的使用
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