用it is adj sb to do sth造句 5例用it is adj for sb to do sth造句.....

问题描述:

用it is adj sb to do sth造句 5例
用it is adj for sb to do sth造句.....

it is easy for me to answer that question
it is difficult for me to work out this problem
it is necessary for me to finish my homework
it is unnecessary for me to sweep the floor
it is happy for me to help others