1、现在进行时
常与now,listen,look等词一起出现，表示正在发生的事情或进行的动作，主语+be动词(am, is, are)+动词ing
例句:He is running now.
Look! It is snowing.
Listen! He is singing in theclassroom.
问句将be动词提前
例句:Are you working hard?
否定句在be动词后+not.
例句:She is not doing her work.
2、一般现在时
表示经常出现，或者反复发生的事情或动作，经常与often, usually, sometimes, always, every day， every week，every month, every year…等词连用。主语+动词原形+其他，当主语为第三人称单数，动词后加s或es
例句:He runs every day.
They often read books .
3、一般过去时
表示发生在过去的事情或者事件，常与just now，two hours ago, yesterday， last week，last month; last year 等词一起使用。主语+be动词的过去式（was/were）
例句:My books were on the desk just now.
I did my homework just now.
4、一般将来时
表示将要发生的事情或动作，常与tomorrow, next week, this week，today等词连用。主语+will +动原 / 主语+be(am, is, are) going to + 动原
例句:I am going to have lunch with my mum.
She will go home.
