各种时态与语态的构成
现在
过去
将来
过去将来
主动
被动
一般
do/does
am/is/are done
did
was/were done
shall/ will do
shall/will be done
should/ would do
should/would be done
进行
am/is/ are doing
am/is/are being done
was/were doing
was/were being done
shall/will be doing
shall/will be being done
should/would be doing
should/would be being done
完成
has/ have done
has/have been done
had done
had been done
shall/will have done
shall/will have been done
should/would have done
should/would have been done
has/have been doing
\
had been doing
shall/will have been doing
should/would have been doing
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