There is somebody here who wants to speak to you.这里有人要和你说话.这里who作什么成分?

问题描述:

There is somebody here who wants to speak to you.这里有人要和你说话.这里who作什么成分?
who在这里充当定语、主语 、表语还是宾语?

who就是somebody,从句里的主语,定语从句的引词