You won't know if the blouse fits you until you___(try) it on.

问题描述:

You won't know if the blouse fits you until you___(try) it on.
请说明汉语意思和理由,

try
你把这个上衣穿上试试才能知道合不合身.请问,not...until的固定用法是后面加动词原形吗?这倒不是。如果until前面是将来时,后面用一般现在时。如果until前面是过去时,后面用动词过去式。