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标题: 语法时态:一般现在时态 [打印本页]

作者: Cammy    时间: 2012-8-26 10:29
标题: 语法时态:一般现在时态
       一般现在时  一.意义:表示经常发生的事情,动作或存在的状态  
  二. 构成及变化

  1.be动词的变化。

  肯定句:主语+be(am,is,are)+其它。如: I am a boy.我是一个男孩。

  否定句:主语+ be + not +其它。如:He is not a worker.他不是工人。

  一般疑问句:Be +主语+其它。 如:-Are you a student?  -Yes. I am. / No, I'm not.

  特殊疑问句:疑问词+一般疑问句。如:Where is my bike?

  2. 行为动词的变化。
  当主语为第一,二人称及复数时,助动词为do

  肯定句:主语+动词原形(+其它)。如: We often play basketball after school.

  否定句:主语+ don't+动词原形(+其它)。如:we don’t play basketball after school.

  一般疑问句:Do +主语+动词原形+其它?
  如: Do you often play basketball after school l? Yes, we do. / No, we don't.

  特殊疑问句:疑问词+以do开头的一般疑问句?
  如: What do you often do after school ?

  当主语为第三人称单数时 ,助动词为does

  肯定句:主语+动词三单式(+其它)。如: He swims well.

  否定句:主语+ doesn’t+动词原形(+其它)。如:He doesn’t swim well..

  一般疑问句:Does +主语+动词原形+其它。
  如:Does he swim well ? Yes, he does. / No, he doesn't.

  特殊疑问句:疑问词+以does开头的一般疑问句?
  如: How does your father go to work?

  三.第三人称单数的动词变化规则(只有在第三人称为主语的肯定句中,动词才用三单式)

  (1)多数动词直接加s:runs gets likes collets takes plays climbs…….

  (2)结尾是s, x, sh, ch, o,前为辅音字母,结尾加es :watches teaches goes does washes crosses mixes brushes

  (3)动词末尾y前为辅音:将y改为i加es: study→studies fly→flies carry→carries cry→cries,但在y前如果为元音则直接加s:buys says

  四.时间标志:always , usually , often , sometimes ,every…





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