Interchange the affirmative sentence into negative sentence. All those boys are intelligent .
ANone of the boys is dull.
BAll boys are dull.
CAll boys are not intelligent .
DNone of these
ANone of the boys is dull.
BAll boys are dull.
CAll boys are not intelligent .
DNone of these
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Change the sentence from one grammatical structure to another without altering its sense. The fort is too high for anyone to climb.