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.

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为什么用wouldbeableto,如果用wasableto可以吗ByrdnowknewthathewouldbeabletoreachtheSouthPolewhichwas300milesaway

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.
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.

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.
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）是打算去做,分2种情况：（1）知道自己有能力,而打算去做 （2）不清楚自己的能力和把握,而打算去做.另外还存在：不管当时有能力没能力做,事实上/历史上并没做和已经做的信息反馈.
此处原文用WOULD BE ABLE TO ,显然是事后才知道当时如果做是能做到,换言之,当时不清楚自己能力,且可能上下文中反映的事实是他当时不管知道自己有无能力,都最终没有去做.
若用WAS ABLE TO 则反映事后知道当时能做,反映不出或不能明显反映出最终没有做.

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...

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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。

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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。

可以

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