新概念英语第一册的语法:新概念英语第一册语法知识梳理：一般现在时

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.

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