2017年6月英語四級(jí)語法知識(shí)點(diǎn):主動(dòng)形式
過去 現(xiàn)在 將來 過去將來
一般
did do will/shall do should/would do
進(jìn)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 (用于虛擬語氣)
完成進(jìn)行
had been doing have/has been doing /
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