(正是因为水涨了)we could not cross the river.It was because the wat

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 19:22:28

(正是因为水涨了)we could not cross the river.It was because the water had risen that
请问为什么用WAS和过去完成时had risen ,也可以使现在完成时吧,

描述的过去情况,在我们渡河之前水已经涨了,过去的过去,所以要用过去完成时
再问：谢谢，那么为什么不是说我们现在不能过河时因为过去河水涨一直持续到现在，用现在完成时，而不是过去的过去呢
再答：前面有could，描述的过去情况。
再问：所以说could一出现就过去时嘛？我原来都一直把它和can混用，以为以为它只是比can表示的可能性要没那么强烈，失态区别还没注意过，，，太弱了，谢谢

(正是因为水涨了)we could not cross the river.It was because the wat it was because the heavy rain,we could dnt go out. the water was so dirty that we could not drink it句型转换 The wa 英文句子改错：but it was strange that we could not open the door We decided not to climb the mountain because it was raining we decided not to climb the mountains because it was raining .---It’s not easy for people to cross the Changjiang River.- The river is too wide.I can not swim___(cross)it cross the river含义 cross the river造句 There is no bridge over the river but we can cross it on a r the cow told him that he could and that the river was not ve