一般现在时 I do.
一般过去时 I did.
过去进行时 I was doing.标志词 while
一般将来时 I will do.结构 will do
现在完成时 I have (ever)done.标志词 ever already
现在完成进行时 I have been doing.结构 have (has) been doing
过去完成时 I had done.
过去完成进行时I had been doing.