【正文】
含情態(tài)動(dòng)詞的被動(dòng)語態(tài)的構(gòu)成:“主語+情態(tài)動(dòng)詞+be+及物動(dòng)詞的過去分詞。如果假設(shè)的情況可以實(shí)現(xiàn)的話,則用陳述語氣,即真實(shí)條件句。結(jié)構(gòu)為If sb. had done sth. , 或sb. would/should/could/might+動(dòng)詞完成式(have done sth.) If you got up earlier, you could have caught the bus. If my mother had been here yesterday, she would have prevented me from doing it. 注意:在這一結(jié)構(gòu)中,如果從句中有表示過去的時(shí)間狀語,其謂語動(dòng)詞也不能用過去式。如果說的不是事實(shí),而是一種假設(shè)、愿望、建議、空想等,就要用虛擬語氣。虛擬條件句的用法主要有:。 If it snows tomorrow