have come to know为什么是come

请问,come to know为什么等于realize?这里的"come People have come to know that their health must______ were to have come have come to用法 come and have something to drink?have是啥意思,为什么用to 为什么是i come here而不是 come to here know、get to know和come to know的区别? 是come here还是come to here? come to do 里, come 是不及物动词? I have just come back.是现在完成时吗?如果是,那come为什么不用过去分词? I have come to say goodbye(to you).这句话中的have come to 怎么去理解?是 They dreams have already come true 为什么是come 而不是came 后面不是说alr