5.(2018北京丰台一模,12)Thank you for reminding me of the time;otherwise I (be)late yes-terday.
答案 would have been 句意:谢谢你提醒我时间,否则,我昨天就迟到了。根据句意可知,此处表示与过去的事实相反的假设,应用虚拟语气,谓语动词用would have done。
6.(2018北京师范大学附中期末,21)The door open, no matter how hard she pushed.
答案 wouldn't 句意:无论她怎么推,门就是打不开。此处所填单词在动词的前面,表示“不起作用”。由pushed可知应用一般过去时。