be+过去分词+to+副词是什么意思
问题描述：
be+过去分词+to+副词是什么意思
例如：Old people must be spoken to politely.
be+过去分词是被动语态,那么to politely是什么意思.
答
主动语态应该是 speak to old people politely.
所以变成被动式就是Old people must be spoken to politely.
speak to是词组 不是to politely.