英语语法问题be supposed to
Patents are supposed to encourage innovation,not stifle it.这句看到以前有人问过,说not前后表并列.我的理解是我们应该……而不应该……那为什么not 后面不加to呢?be supposed to 应该是固定搭配啊,但是貌似又没有be supposed not to 的用法,因为要否定前置.比较迷糊,