A passenger acted as another set of eyes for the driver in the testA passenger acted as another set of eyes for the driver in the test and even stopped or started talking depending on the difficulty of conditions outside the car.. and even stopped or started talking depending on the difficulty of conditions outside the car.. 在测试中，由1名乘客充当司机的另外一双眼睛，该乘客会根据车外情况的复杂程度来选择是否与司机交谈。 题主问题中的acted,stopped, started 都是谓语动词。even是即使的意思。 depending on的逻辑主语是and后面的一整句话，即：乘客与司机谈话或是停止谈话取决于……。是对and后面那句进行补充的，即句子补充性状语。 如有疑问可继续追问。