一：形式主语或形式宾语it
那些未曾去过那个小村庄的人很难描绘出它的美丽。（ it ）
It is very hard for those who haven’t been to  the small village to describe its beauty.
我发现很难与那些一贯固执己见的人合作。（it ）
I find it hard/it is hard to cooperate with those who always stick to their own opinions.
常需要用形式主语来翻译的情况
1、It’s + adj. + of/for sb. to do sth. Eg. It’s so careless of you to make so many spelling   mistakes in the English exam