should,would,could,must,might,may,can答:注意:could, might表示推测时不表示时态,其推测的程度不如can, may。 7 情态动词+ have +过去分词 1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情。 Philip may (might) have been hurt seriously in the car accident. Philip can (could) have...