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新概念英语第一册语法总结:一般现在时

   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.
  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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