2017年6月英语四级语法知识点：主动形式
2017年6月英语四级语法知识点：主动形式过去 现在 将来 过去将来
一般
did do will/shall do should/would do
进行
was/were doing am/is/are doing will/shall be doing
完成
had done have/has done will/shall have done should/would have done
(用于虚拟语气)
完成进行
had been doing have/has been doing /
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