请高手阐释此句中to be caught充当的成分
问题描述：
请高手阐释此句中to be caught充当的成分
如题.
Yuhanna Ibrahim and Boulos Yaziji,who are from two different branches of the Orthodox Church,are the most senior clerics to be caught up directly in the Syrian conflict.
Yuhanna Ibrahim和Boulos Yaziji来自东正教堂的不同分支机构,他们是叙利亚冲突中直接被抓的最高牧师.
如果不用这个不定式to be caught,那么可以将此句改成什么样?
答
to be caught up是不定式作定语,修饰clerics,不用不定式,可以改成Yuhanna Ibrahim and Boulos Yaziji,who are from two different branches of the Orthodox Church,are the most senior clerics who are to be caught up directly in the Syrian conflict.