mother, mother's, mothers ', know, have known, will know If you

mother, mother's, mothers ', know, have known, will know If you put yourself in your ________ position, you ________ why she was so worried.
【正确答案】：mother's; will
【题目解析】：此句的意思是“如果你把你从你妈妈的角度上考虑，你就会明白她为什么如此担心。”第一空是属格用mother’s；条件状语分句用一般现在时，主句用一般将来时。