我认为它不在书包里用英语怎么

　　“我认为它不在书包里。”用英语可以说：“I don't think it's in the schoolbag.”

解析：

　　在英语中，“认为......不......”要用“don't think...”这种否定转移的形式来表达。“在书包里”常用“in the schoolbag”来表示。所以“我认为它不在书包里”就翻译为“I don't think it's in the schoolbag.” 这种表达方式更符合英语的语言习惯和逻辑。

　　例如：I don't think he is right.（我认为他不对。） 同样使用了“don't think”的结构。与“ I think he isn't right.”这种直接否定的形式相比，“I don't think he is right.”更加地道和常用。