only when you nearly lose someone () fully conscious of how much you value him. 这是倒装句吗?填什谢谢，题目是我改了的，
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that,有标志词only,这不是倒装句,倒装句简单的判断是谓语动词置于主语之前.这里that后面省略了主语you,和前半句共用一个.
======以下答案可供参考======
供参考答案1:
areonly引导的倒装
好像少个主语
供参考答案2:
是倒装句。应该填are you
判断倒装的方法：在句首的only如果后面跟了副词、介词短语或从句等状语，则主句用倒装结构。如果only后面跟的是主语，就不用倒装结构了.
eg:Only when the war was over in 1918 was he able to get back to work.(倒装）
Only the teachers are allowed to use the room.（不倒装）
你这句only后面跟的是从句，显然需要倒装