He is said to be very good.这句话对吗,为什么TO后面要加be?

为什么有时候要在is going to后面加be? The water is very good to drink.这句话中水应该是被喝啊,为什么不用 to be drun He seems to be honest为什么要加to be. they are said to be very good怎么翻译 这句英语为什么要加?She deserved to be punished.这句话中to 后面为什么加的是be而不是by seem to be为什么seem 的后面要加to We are less credulous than we used to be.这句话里面used后面为什么要加to The first thing I want to do is have a good rest.这句话对吗?is后面加 there is nothing to worry about这句话后面为什么不能换成 to be worried? there is nothing to worry about这句话为什么后面不能用 to be worried abo It must be terrible to be grown up!这句话里为什么要加be呢? there is going to be snow这句话对吗