为什么是I find science really difficult ,而不是I find science is really difficult
问题描述：
为什么是I find science really difficult ,而不是I find science is really difficult
答
两句都可以,第一句是简单句 句子结构为主语+谓语+宾语+宾语补足语,第二句为复合句 主语+谓语+宾语从句