have been done是什么時(shí)態(tài)

回答

瑞文問(wèn)答

2024-08-18

have been done是現(xiàn)在完成時(shí)的被動(dòng)結(jié)構(gòu)。
例句：
Trivial formalities have been done away with.
繁瑣禮節(jié)都取消了。
What could have been done better?
有哪些本可以做的更好？

擴(kuò)展資料

　　It could have been done carefully.

　　它可能被小心地搜尋過(guò)。

　　But no studies have been done in WOMEN.

　　但沒(méi)有對(duì)女人進(jìn)行的研究。

　　The same studies have been done in Asia.

　　同樣的研究也在亞洲。

以和已的區(qū)別和用法和也初一生開(kāi)學(xué)要準(zhǔn)備什么