什么叫做主语和表语是非谓语形式？

非谓语就是不能充当动词的形式，3种：to do(不定式)，ved，ving
A:to do可以在句子里做主语，表语，状语，宾补。to see is to believe
my next job is to help the old.
he works so hard to make a living.
i don't want to talk with you.
B:ved.动词过去分词，有形容词的意思。
。给你个连接，自己去看吧。