为什么要说“I don't think so”而不说“I'm not think so”

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• Can I put these things away?A.Let me have a look.B.I don't think so
• Don`t think so (I know)翻译中文
• 已知二次函数y=ax²+bx+1 一次函数y=k（x-1）-k²/4 若它们的图像对于任意的非零实数k都只有一个公共点 则a b的值分别为
• 二次函数y=ax².y=ax²+c.y=a（x-h）².y=a(a-h)²+k.y=ax²+bx+c的