difficult后面加什么形式

　　Some people find this more difficult than others.

　　这件事有人觉得难，有人觉得不难。

　　I find it difficult to be objective where he's concerned.

　　只要涉及他，我就难以做到保持客观。

　　It's difficult for them to get here much before seven.

　　他们很难在7点以前早早地来到这里。

　　It is difficult for young people to find jobs around here.

　　年轻人要在附近找到工作很难。

　　Some teachers find it difficult to keep their classes in order.

　　有些教师觉得难以维持课堂秩序。