I think I disagree with that explanation. (I'd interpret it as "I could almost touch the ceiling"). With regard to your second question , "could" is better than able because "able" is more often used when speaking of our abilities.
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Ivanhr (I'd interpret it as "I could almost touch the ceiling").
Ivanhr"could" is better than able because "able" is more often used when speaking of our abilities. You're speaking of a one-time action so "could" is more app