It is somewhat disturbing to note, today, 46 years later, that the command of the spoken languages of this world, are still no better!
Its not so surprising when you understand the construction of the language and the differences between them.
Eg, we would grammatically say that 'john rides a big horse'
in another language, they obviously have thier own way of pronunciation, but the sentence could be assembled in a different context, Eg, 'horse of large size, john riding'
once this is brought down the base understanding of each language, it means the same thing.
When you consider that someone may have grown up learning to speak one way, and still does, then has to learn to speak backwards in another language, there is bound to be some confusion, even after you have been speaking that new language for a long time.
We have a chinese guy here at work, he can be a bit difficult to understand, not just because of the heavy accent, but because he often does speak backwards a bit.
If he was any shorter and green, we'd call him yoda.
I remember hearing somewhere, that of all the languages on earth to learn from scratch (eg, not as your primary language)
English was one of the hardest, doe to so many nuances and differning meanings within the same word, depending on how its arranged in context.