英语语法,这个句子对吗?有语法错误吗?

题目

英语语法,这个句子对吗?有语法错误吗?
Nowadays , an increasing number of people concerned about（or as to）the phenomena……However , whether you prop up it or not has caused heated debate.

答案

不太对.首先,Nowadays就表示是现在,后面不能用过去时.另外,whether后面加or not有点多余了,you之后时态不明.可以用should.最后prop up it 改为prop it up.
建议改为：
Nowadays ,an increasing number of people concern about（or as to）the phenomena.However ,whether you should prop it up has caused heated debate.