Loose and Lose
Incorrect : Be careful not to loose your money.
Correct : Be careful not to lose your money.
Incorrect : One of his teeth is lose.
Correct : One of his teeth is loose.
Note : Lose (with a single "o") is a verb meaning "no longer have something as a result of carelessness or accident and then not to be able to find it'. But loose (with double 'o') is an adjective meaning "not firmly fixed'.
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