时态

时态分为：时间跟语态
语态分为：一般，进行，完成，完成进行
时间分为：现在，过去，将来，过去将来

一般现在：do/is/am/are
一般过去：did/was/were
一般将来：will do/be going to do/shall do
一般过去将来：would do

现在进行：be doing
过去进行：was/were doing
将来进行：will be doing
过去将来进行：would be doing/(was/were) going to do

现在完成：have/has done
过去完成：had done
将来完成：will have done
过去将来完成：would have done

完成进行：表一段时间持续进行
现在完成进行：have/has been doing
过去完成进行：had been doing
将来完成进行：will have been doing
过去将来完成进行：would had been doing