帮忙看两个句子的差别1.It's impossible for him to work out this problem

It's impossible for him to work out this Maths probiem. It's difficult for him to work out this maths problem 同义句是什么 lt's difficult for him to work out this maths problem的同义句 （急!）：It isn't easy for him to work out this problem.I though It's clever for him to work out the difficult math problem.单 I found it impossible to work out this maths problem 不加be动词也 I find that it it hard for him to work out the problem.句型转换 ——It's impossible for him to finish the work on time,__? Simon said it was possible for him to work out the problem b it was very difficult for him to work out the problem改为同义句 改为同义句I find that it is hard for him to work out the problem. it was very difficult for him to work out the problem 改为同义句