He had trouble sloving this problem.同义句

He had trouble sloving this problem.同义句 He had trouble solving this problem.改为同义句：He had（ ）（ ）（ ）sol he had a problem with math this week同义句 He tries to work out this problem,but he can’t.同义句转换! It difficult for him to solve this problem alone.改同义句 He has I don't think he can work out this problem alone (同义句转换） He has no trouble working on this problem,句子中为什么用 no,为什么用 on This maths problem is easy to work out.同义句This maths problem 同义句转换this math problem is more difffficult than This is a difficult problem的同义句是什么 Finally,he worked out the problem.(改为同义句） 1.The headmaster _____ to him that this was a trouble he had