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will be able to 和 will have to 的区别和用法

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will be able to 和 will have to 的区别和用法
will be able to 和 will have to 的区别和用法
首先讲一下will have to是have to 的将来式.
I’ll have to...=It will be necessary for me to...
i.e.It will be necessary for them to pass a special test.=They will have to pass a special test.
be able to
  a.位于助动词后.
  b.情态动词后.
  c.表示过去某时刻动作时.
  d.用于句首表示条件.
  e.表示成功地做了某事时,只能用was/were able to,不能用could.
  He was able to flee Europe before the war broke out.
  = He managed to flee Europe before the war broke out.