英语达人快进啊！~！急啊！~下面是几个单句辩错，帮忙做一下：

He didn't see the film last night because he had seen the film before.
看过电影时发生在昨晚之前的事情，，是过去的过去，自然要用过去完成时。
Mr.zhang with a lot of students is climbing the mountain.
A with B...这种结构作主语时谓语动词的单复数要与A一致.

He didn't see the film last night because he had seen the film before.
是过去完成时，因为是过去的时间。
Mr.zhang with a lot of students is climbing the mountain.
A with B..
谓语要和主名词一致。