Mr zhang with his students ( )(be) in the classroom.

题目

Mr zhang with his students ( )(be) in the classroom.
答案是is,但不知为什么?>- (小坏在此鞠躬!)

答案

with his students要抛开了看,Mr Zhang是三人称单数所以be动词用is
如果把with换做是and,就要看做一个整体.就应该用are.