When speaking, how would one say "cannot study"? E.g. 不能学习 or 学习不了 or 无法学习 Recently, I've been turning my Chinese learning towards speaking and listening, rather than reading and writing.  Now, I might say "cannot study" in a few ways:


不能学习
学习不了
无法学习


The sentence I have in mind is this:


  所有数学家都需要咖啡，没有咖啡每个数学家无法学习。


I know the sentence is not really true---it's hyperbole to express "mathematicians cannot study without coffee".

I feel like 无法学习 is more written than spoken, and maybe 不能学习 is a bit simplistic.  I don't really know.

Question: When speaking, how would one say "I cannot study"?
All of your answers are right. the difference is, on mainland Chinese, 无法学习 is the most formal one, as in scientific reports; 不能学习 is what we say if we are writing dairy/novels. 学习不了 is the most informal one, usually used when talking to friends, etc.

Note I used mainland Chinese, because I don’t know how they say it in HK/TW/Macau.