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主动语态(以 do 为例:)
过去 did
现在 do
将来 will/shall do
过去将来 would / should
一般
do
进行
was/were doing
am/is/are doing
will/shall be
doing
would / should
be doing
完成
had done
have/has done
will/shall have
done
would / should
have done
完成进行
had been doing
have/has been
doing
will/shall have
been doing
would/should
have been doing
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