English example sentences with "quack"

The cow goes "moo," the rooster goes "cock-a-doodle-doo," the pig goes "oink, oink," the duck goes "quack, quack" and the cat goes "meow."
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"Quack, quack," said the duck.
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He must be a quack doctor.
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My mom thinks the doctor is a quack.
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You listen more to what this quack says than what the doctor says.
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Mary is a quack doctor.
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"Quack, quack!" the duck said.
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The duck quacks 'quack quack'.
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Ducks quack.
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I'm a duck, quack. I speak English, quack.
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Quack quack!
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Vilbert was an itinerant quack-doctor, well known to the rustic population, and absolutely unknown to anybody else, as he, indeed, took care to be, to avoid inconvenient investigations.
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"Yes." And Jude told him the names and addresses of the cottagers who were willing to test the virtues of the world-renowned pills and salve. The quack mentally registered these with great care.
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He was an unsophisticated boy, but the gift of sudden insight which is sometimes vouchsafed to children showed him all at once what shoddy humanity the quack was made of.
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I've heard a duck quack, but I haven't heard a frog croak yet.
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Quack!
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My mother thinks that the doctor is a quack.
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