今天我们所要讲的就是第一种： 一般现在时——表示一般性，经常性的动作或一般性事实。
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?
Do the students like smart teachers?
★变否定句在主语和动词之间加don"t.
You don"t want to have a bath.
We don"t have any meat.
The students don"t like smart teachers.
★肯定回答及否定回答
Yes, I do. / No, I don"t.
Yes, we do. / No, we don"t
Yes, they do. / No, they don"t.
