It is + adj.for sb.to do sth.和动词-ing做主语的句型转换Saving endangered animals is one thing we can do for our world 转换为 It is +adj.for sb.to do sth.的形式
问题描述：
It is + adj.for sb.to do sth.和动词-ing做主语的句型转换
Saving endangered animals is one thing we can do for our world 转换为 It is +adj.for sb.to do sth.的形式
答
To saving endangered animals is one thing for us to do.
答
it is necessary for us to save endangered animals .
答
It is necessary/important for us to save endangered animals.