求翻译和用法及场合 IT MUST BE DOWN

求翻译和用法及场合 IT MUST BE DOWN what an easy life it must be翻译及分析 It must be come true用法对吗? It must be come true用法对吗? 求大侠翻译一下 It must be a sad story must be的用法和意义 翻译It must be fastened tightly back must表推测的用法我以前记得must be一定和can't be一定不是和may be或许（表推测） 我还见过完成时态的表推测it must weigh a few tons（它一定有好几吨重）这句话中为什么没有be直接翻译就是 它必 must be的用法 should be could be must be will be 的用法及区别 It's not worth it,though和what's the point in翻译及用法 求翻译：achievement is never a given.It must be earned 英语翻译it might be fun 和it must be must be的用法和must have been的用法是什么? have to 和 must的区别及用法上 it must be drilled to accept the downshop leads.翻译 It Must Be?歌词 it must be