8.should have done sth 估计已经做了某事 否定形式:should not have done 例:She should have arrived in her office by now. 八.动词不定式句型 (1) It takes / took / will take sb. some time / money to do sth.某人花/花了/将花多长时间/多少钱做某事. 例句:It ...