作者：姜经志肯定句否定句情态动词介词短语
摘要：变肯定句为否定句,通常是在助动词、情态动词或系动词be后面加not构成。例如:He will come tomorrow.→He won’t come tomorrow.He is twelve years old.→He isn’t twelve years old.You can bring them back next Monday.→You can not bring them back next Monday.
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