1.概念：表示在過去某一時間對將來某一時刻以前所會發(fā)生的動作，常用在虛擬語氣中，表示與過去的事實相反。
2.基本結(jié)構(gòu)：should/would have done sth.
3.例句：
I thought you'd have left by this time.我想這會兒你已經(jīng)走了。
He told them he would have finished it by 8 o'clock.他告訴他們他會在8點以前干完。
2.基本結(jié)構(gòu)：should/would have done sth.
3.例句：
I thought you'd have left by this time.我想這會兒你已經(jīng)走了。
He told them he would have finished it by 8 o'clock.他告訴他們他會在8點以前干完。