it+be+adj+to do something和it+be+adj+doing something的区别

问题描述:

it+be+adj+to do something和it+be+adj+doing something的区别
尽量简单而准确

it+be+adj+to do something
It is easy to learn Chinese学习汉语很简单(表示准备去做)
it+be+adj+doing something
It is easy playing Football踢足球很简单(表示兴趣,已经做过)