为什么用would be able to ,如果用was able to 可以吗Byrd now knew that he would be able to reach the South Pole which was 300 miles away,for there were no more mountains in sight.
问题描述：
为什么用would be able to ,如果用was able to 可以吗
Byrd now knew that he would be able to reach the South Pole which was 300 miles away,for there were no more mountains in sight.
答
可以
答
不可以，此处是过去将来时态
Byrd看到眼前再没有山了，他知道他可以到达300英里远的南极。表达他将有能力到达的意思。
答
对 to reach the South Pole 这件事 在细微层次的理解和潜在的信息是不同的.比如一个人在几年前要去做1件事 和一个人在几年前做了/做过1件事的概念是不同的.在此,to reach the South Pole 这件事,在当时（几年前）是...
答
Byrd now knew that he would be able to reach the South Pole which was 300 miles away, for there were no more mountains in sight.
now knew“现在知道”但是还是表示过去，只能说是过去某个时间，那个时候的现在，而would be able to是发生在knew的前面。是虚拟语气。与过去的过去相反。
was able to单单是指过去。