4. We could hear the airplane but could not see it because it was concealed above the clouds.
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park sang joonI have rephrased #1 into both #2 and #3, but both don't make sense.A small aside: Try not to combine a universal quantifier (all, both) with a negative verb. It's better to make the quantifier negative instead of the verb: neither makes sense.
I see the phrase as describing 'it', ie 'the airplane'.
It's n