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…