I don't see no reason why I shouldn't trust him.
Is the sentence above grammatical?
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I've derived that sentence from the other: My dad trusted him, and I don't see no reason why I shouldn't.
"I don't see no reason" is an incorrect way of saying "I don't see any reason" or "I see no reason". This kind of misuse of the double negative is characteristic of uneducated English.
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"I don't see no reason" is an incorrect way of saying "I don't see any reason" or "I see no reason". This kind of misuse of the double negative is characteristic of uneducated English.
Try either
I see no reason why I shouldn't trust him.
or
I don't see any reason why I shouldn't trust him.