动词的时态：16种【动作发生的时间+状态】通过谓语动词的变化表达 过去、现在、将来
一般时态：
1>.一般过去时：V过去式 did (was/were) 强调过去，无关现在
He was a student .他过去是个学生(现在不是了，完全是过去的事,无关现在)
2>.一般现在时：V动词原形(do)/V动词第三人称单数(does):情态动词没有第三人称单数
主语：He She it ; 可数名词单数；不可数名词 + Does
You like English . He likes English .（动词+s:第三人称单数 ； 名词+s：数量增加，复数）
He was a student .他过去是个学生(现在不是了，完全是过去的事,无关现在)
用法：A：现在经常性，习惯性发生的动作
B：现在的状态(静态的状态)
C：永恒a.客观事实；科学真理；名言警句。
补充：与频率连用
every day/month; once a week , twice a month
always, usually ,often , frequently .sometimes ,occasionally ,seldom ,hardly , never .频度副词，频率从高到低。
3>.一般将来时：Will 或者 am/is/are + going to + V动词原形
将来的事(现在的将来)
I will make a new plan tomorrow .（临时决定）
We are going to study abroad next year .（经过深思熟虑计划好的）
进行时态：Be Doing
A.过去进行时：was/were + doing
B.现在进行时：am/is/are+ doing
C.将来进行时：will/shall + doing
At 10 o’clock yesterday some students were taking an exam in their classrooms.(过去进行时)
We are talking about the water pollution .（现在进行时）
A great many candidates will be meeting here at this time tomorrow .(将来进行时)