关于independent和dependent 句子

问题描述:

关于independent和dependent 句子
Charlie has decided to hire a personal trainer because he is worried about his heart.
because后面那段句子为什么是dependent sentence?他不是有主语HE,谓语,IS和宾语,WORRIED.

翻译为:Charlie已经决定雇佣一个人事培训师,因为他担心自己的心脏.
because引导的是原因状语从句,因为...