分类：教育/科学-外语学习-英语考试
问题：什么是counter
什么是counter-factual.?比如We miss the train, so we are waiting on this cold platform.(using counter-factual conditionals)这样的句子要怎么改写?
回答：counter-factual condionals非真实条件句　　1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。　　a.　 同现在事实相反的假设。　　句型 ： 条件从句　　　　　主句 　　　　　　一般过去时　　　should( would) +动词原形　　　If they were here, they would help you.　　b.　 表示于过去事实相反的假设。　　句型： 条件从句　　　主句　　　　　　　　　　过去完成时　should(would) have+ 过去分词　　　If she had worked harder, she would have succeeded.　　　　　The rice would not have been burnt if you had been more careful.　 　　　If my lawyer had been here last Saturday, he would have prevented me from going. 　　　If he had come yesterday, I should / would have told him about it.　　　含义：He did not come yesterday, so I did not tell him about it.　　　If he had not been ill and missed many classes, he would have made greater progress.　　　含义： He was ill and missed many lessons, so he did not make greater progress.　所以，你上面那句应该是If we didn't miss the train,we wouldn't  be waiting on this cold platform.