归纳英语的四种时态

一般现在时:表示客观事实或是一段时间内是事实.
谓语用动词原形(当主语是第三人称单数时,谓语得加S.(方法与名词复数类似,只是表达含义不同)
he is a worker.
she goes to the park every sunday.
现在进行时:表示说话时那动作正在做着或是发生着.
谓语用:be + doing(动词加ing).
i am reading.
Tom is playing football with his friends in the park.
一般将来时:表示一种计划或是打算,或是某事在说话后的一段时间里会发生.
1.be going to do
2.will/shall/+do
he is going to go to the suppermarket with his mother this afternoon.

i will study very hard from now on.
一般过去时:表示过去曾经发生过的事,且那事的结果与现在无关(因为现在完成时强调事情的结果与现在有关).
谓语用过去式
helen went away.
Mary heard from a letter yesterday.

so, where is your question?

问题是什么呀