It is___(easy easily) to work out the problem.

It is___(easy easily) to work out the problem.
It is___(easy easily) to work out the problem.

It is___(easy easily) to work out the problem.
It is easy (easy easily) to work out the problem.
is 是be 动词,后边接形容词,easily是副词,修饰动词.

easy
固定句型：It's +形容词(+for sb.)+to do sth.

easy

It is +形容词+to... 填easy

It is easy to work out the problem.算出那道难题很容易。
注：be + adj.