Facing the great selections of these courses, some people say that, 谓语在哪为什么直接用非谓语ing

题目

Facing the great selections of these courses, some people say that, 谓语在哪为什么直接用非谓语ing
Facing the great selections of these courses, some people say that, history classes should be made compulsory for college students . 谓语动词是谁 怎么直接就facing了 完整的句子是什么?

答案

Facing the great selections of these courses这是现在分词短语 作状语 相当于一个状语从句 因为与句子主语是主动关系故 用现在分词
some people是主语 say是谓语
that,history classes should be made compulsory for college students是宾语 .
原句= when some people face the great selections of these courses,they say that history classes should be made compulsory for college students
当从句 中的主语 与主句主语 一致 时 可以用分词短语 代替 状语从句