我做了一到這?擁念}:It must have rained last night.昨晚肯定下了雨.老??說(shuō)這句?的?釉~要用完成?r.但后面有??確切?r間"last night",不是有確切?r間用過(guò)去?r??我不明白這????提是怎麼回事,是我什麼理解錯(cuò)了?麻?┐蠹?臀醫(yī)獯?謝謝!

熱心網(wǎng)友

must have done sth,表示對(duì)過(guò)去某人行為的推測(cè)，且把握性極大，基本肯定．如果不敢肯定，便說(shuō)may/might/can/could have done.must have done 可有明確過(guò)去時(shí)間．反意問(wèn)句為：didn't he/she/...? 如果沒(méi)有過(guò)去時(shí)間，反意問(wèn)句為：haven't/hasn't you/they/he...? 注意：must have done的否定形式為can't/couldn't have done.

熱心網(wǎng)友

must have done是對(duì)過(guò)去有把握的推測(cè) 是固定句型！背下來(lái)就好了

熱心網(wǎng)友

對(duì)過(guò)去的推測(cè)你試試用“一定已經(jīng)下過(guò)雨了”來(lái)理解看，會(huì)不會(huì)好理解一些？

熱心網(wǎng)友

有具體的時(shí)間就不能用完成時(shí)

熱心網(wǎng)友

表對(duì)過(guò)去的事實(shí)進(jìn)行推測(cè)

熱心網(wǎng)友

must have done 是用來(lái)表 推測(cè)的,用在肯定句中