The old should be spoken to politely 为什么副词前有to

The old should be spoken to politely 为什么副词前有to the old should be spoken to politely求翻译,其中副词前加to是 翻译：The old should be spoken to politely . Old people must be spoken to politely . 改错：Old people should be spoken politely.为啥要改成 spoken to old people should be spoken to politely为神马要用to? 关于被动句.1 Old people should ________ to politely 选项A（be spoken You should speak to the old politely. I think the old should be spoken to _____(polite) We all know that the old should be spoken to ( ) old people must____.A.be spoken to politely B.be spoken poli 改错1.Old people should be spoken politely 2.Nobod