本句的意思是,如果我們有時(shí)間的話,我們就已經(jīng)完成工作了（事實(shí)上我們沒有時(shí)間,與事實(shí)相反,要用虛擬語氣）
表示與過去事實(shí)相反的虛擬條件句.其句子結(jié)構(gòu)為：
從句：If + 主語+ had +過去完成式動(dòng)詞+ ……
主句：主語+ would (should,could,might) + have +過去完成式動(dòng)詞+……
例如:
⑴、If you had taken my advice,you would not have made such a mistake.如果你聽了我的勸告,就不會(huì)犯這樣的錯(cuò)誤.（事實(shí)上你沒有聽我的勸告）
在非真實(shí)條件狀語從句中,謂語動(dòng)詞按正常情況“后退一步”.也就是：
①與過去事實(shí)相反,在從句中用過去完成時(shí)形式表示.
②與現(xiàn)在事實(shí)相反,在從句中用過去一般時(shí)形式表示.
③與將來事實(shí)可能相反,在從句中用過去將來時(shí)形式表示.
主句中則用情態(tài)動(dòng)詞would,should,could 等加一個(gè)與從句一致的動(dòng)詞形式.例：
⑴、If I had come her yesterday,I would have seen him.
⑵、If I were a teacher,I would be strict with my students.
⑶、If it should snow tomorrow,they couldn't go out.