.it's easy to understand 还是.it's easy to understand it

问题描述:

.it's easy to understand 还是.it's easy to understand it

it's easy to understand中的it是有实际意义的,应该是指代上文中提到的事物,或者是说话者和听话者都清楚的一件事物.
it's easy to understand it中第一个it是形式主语,构成it's adj to的句式,而第二个it相当于上一种情况中的it,应该是指代上文中提到的事物,或者是说话者和听话者都清楚的一件事物.