关于to the best of one’s ability 的使用方法，我已知它的意思（尽力，全力以赴），在词典中也可查到例句：
Just try to do the job to the best of your ability. 试着尽你所能将工作做好。
He completed the job to the best of his ability. 他尽全力完成了工作。
I have always done my work to the best of my ability. 我做事一直都是尽自己最大努力的。
我的疑问：
1. to the best of one’s ability中的ability可以用复数吗？
2. 若表示“全力以赴做某事”，后面是接不定式还是in doing sth, on doing sth之类的？
1. to the best of one’sability中的ability可以用复数吗？
答：ability 用单数或复数都可以（但用复数不如用单数普通）。以下是摘自柯林斯词典的讲解和例句：
If you do something tothe best of your abilities or to thebest of your ability, you do it as well as you can.
I take care of them to the best of my abilities. 我尽我所能地照顾他们。
They tackled them to the best of their ability. 他们全力以赴给予解决。
2. 若表示“全力以赴做某事”，后面是接不定式还是in doing sth, on doing sth之类的？
答：对于to the best of one’s ability 的用法，大家一般既不需要 to thebest of one’s ability to do sth，也不需要to the best of one’s abilityin / on doing sth 等，它一般所用的结构是 do sth to the best of one’s ability，这里的 to thebest of one’s ability 起强调用途（指“到能力的极限”，也就是“尽力”“全力以赴”的意思），你一个人摘录的句子已充分说明了这一点。再补充几例句，你注意领会：
Just do the work to the best of your ability. 只须你尽力做就好了。
We will keep you informed to the best of our ability. 大家将全力以赴为你提供最新信息。
I will carry out your instructions to the best of my ability. 我将尽全力实行你的指示。
I promise to carry out my duties to the best of my ability. 我许诺就自己能力所及履行我的职责。
Every game, we go out and play to the best of our ability. 大家每场比赛都倾尽全力地去拼。
We must exploit what we have to the best of our ability. 大家需要尽可能借助大家拥有些所有。
