but there is another thing you must remember it.为什么不加it?
问题描述：
but there is another thing you must remember it.为什么不加it?
答
(that)you must remember 定语从句 修饰thing ，remember 的宾语是关系词that ,所以it多余。
答
you must remember是宾语从句 这句话里的宾语已经是another thing了 所以不用再加it
答
这是个定语从句,省略了that .这样看吧,通俗点：
but there is another thing.还有另外一件事
you must remember it.你必须要记住它.
它 （it ）指代的就是这件事.
两句合并,就要省略一个,否则就重复了啊