problem trouble matter 能否加S?3天之内谢谢.有详解也好.补充下1.no problem or no problems?2.each 和every 后接动词 要看做单数还是复数？

problem trouble的区别 matt matt matt matt question problem trouble wrong 区别 problem和trouble的区别 matter.trouble.problem.difficulty可数,不可数 difficulty,trouble,problem,quesfior的区别 difficulty problem trouble区别还有哪个可数 problem,trouble,matter,question的区别 trouble,problem,question有什么区别 trouble problem question matter 的区别 problem question trouble?三者怎么区别？ He had trouble sloving this problem.同义句 I have much trouble _____ (solve) the problem.怎么填? matter problem trouble wrong的区别帮帮小弟啊, trouble与problem的区别?如题··