英语Byrd now knew that he would be able to reach the South Pole was 300miles away .最想知道句中的would be able to 是什么时态,尤其想了解would 后面一定要有个be will 后面也一定要跟be why thankyou .
问题描述：
英语Byrd now knew that he would be able to reach the South Pole was 300miles away .最想知道句中的would be able to 是什么时态,尤其想了解would 后面一定要有个be will 后面也一定要跟be why thankyou .
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