一般现在时.动词原形do
如:I do my homework every day
一般过去时.动词原形后加ed
如:What did you do on Friday I visited my grandmother (did是do的过去时,visited是visit的过去时)
现在进行时.be动词加动词ing
如:I am watching TV now
现在完成进行时:had been doing(doing可以是任何动词原形加ing)
如:I have been writing letters for an hour
不好意思,本人今年也不过初中,所以学到的也不是很多,知道的都在上面,恐怕没你想要的那么完整,