英语义、考试规则、词组
四级语法讲义
一：时态：所谓的"时态"，就是时间+状态。谓语动词的时态见下表：
1．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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