新概念英语第一册语法学与练：一般现在时

英语自学网

　　英语中的时态一共有八种，它们是：一般现在时、现在进行时、一般过去时、现在完成时、一般将来时、过去进行时、过去完成时、过去将来时。
        　　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.
       
            
            

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        　　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。
       
            
            

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        　　(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.