“情态动词+have done”表推测一览表情态动词+ have done用法例句must have done一定已经做了They must have finished their wor...
“ 情态动词 +have done” 的用法 一、 “ must have done” 一定做过某事• 表示对过去事情的肯定推测，该结构只用于肯定句。...
“情态动词＋havedone”重点讲解如果他学习努力，他就会通过期末考试了。Ifhehadworkedhard,hewouldhavepassedtheFinalexamination.一、在...
