diffcult, work out, problem, the ,it, is, to 连词成句

I found that diffcult to work out the problem 改错 but it could work out a lot diffcult problems we have a good idea to work out the two __ (diffcult) diffcult, work out, problem, the ,it, is, to 连词成句 THE problem is very diffcult.he can't work it out .（合并）THE proble is ____diffcult ____him ____work out The physics problem is too diffcult for us_____.A;work it out B;to work it out C;to work out it D;to work out以及选的理由. The problem is very diffcult.Wecan't work it out.（合并）The problem is ____ difficult for _____ _____ work out.对不起 请问一下为什么？ it's so diffcult a question.i think he will have problems （ ）.A work it outB working it outC in working out itD work out it The boy is very clever.Im sure he is a-----to work out these diffcult problems 英语问题--定语丛句That was so diffcult a maths problem____none of us could work out. the exrcise is very diffcult.we can not work it out.合并为一句 the exrcise is__diffcult for us___work out. diffcult Do you think yesterdays math problem was diffcult?yes, could _____ work it out A.hardly B.easilyC.finally D.nearly work out work out We found it diffcult ( ) [finish] the work on time . So diffcult did I find it to work out the problem.这个句子结构帮我分析一下为什么要有did 不用倒装句 用陈述语序怎么表达啊 把The math problem is too diffcult to work out变too...to句型（三种同义句）还有The room is too small for us to live in和The schoolbag is too expersive for me to buy