它肯定死了 It must be dead还是It must be died 为什么

它肯定死了 It must be dead还是It must be died 为什么 It Must Be?歌词 it must be 什么情况下肯定推测用it must be 什么情况下用he/she must be为什么推测人时 这几个人称代词都可用? It Must Be Love 歌词 It must be some catch. It must be him 歌词 it must be _____(interest) it must be rainy( )( )(随后) it must be imagination 歌词 It must be very happy. It must be something like it. 英语翻译：桌上的帽子肯定是露西的（must be） Must she do it now?(做肯定回答) 英文!（我的包包）被偷了=It has been stolen...那有人偷走了它说someone has stolen it有人肯定把它偷走了为什么说someone must have stolen it,要用HAVE不用HAS?它肯定被人偷走了为什么说it must have been stolen 英语翻译it might be fun 和it must be there must be something wrong to it It must be there,---?反意疑问句