this maths problem.为什么加s

__ __ THIS MATHS PROBLEM IS ! It is difficult () out this maths problem this maths problem.为什么加s Can you work out this maths problem?同义句___you___ ___ work out this maths problem? this maths problem.为什么加s this是单数啊 is this maths problem 要用easy还是easily This maths problem is____________ and I can do it_____________ . 29.Finally,she worked out this Maths problem.(同义句) To work out this maths problem is difficult.(同义句转换) __difficult __ work out this maths problem I spent two hours on this maths problem这句话里on this maths problem做什么成分 To finish this maths problem is difficult(改成同义句） （）（）（） finish this maths problem I spent two hours on this maths problem.maths 应该错了吧 Everyone hsa fun at the party for halloween该为同义句Finally,she worked out this Maths problem同义句 It's difficult for him to work out this maths problem 同义句是什么 He开头同义句的空格是这样 He [ ] [ ] [ ] out this maths problem lt's difficult for him to work out this maths problem的同义句He _____ _____ ______out this maths problem This Maths problem is difficult.I can't work it out.的同义句This Maths problem isn't ______ ______ ______ ______ to work out. If you help me,I can work out this maths problem改为if条件状语从句———,I can work out this maths problem This maths problem is easy to work out.同义句This maths problem is not _____ to work out.括号填什么