为什么是must be die而不是must die?die不是动词吗?

For thou must die “all man must die ”是啥意思? we must love one another or die all that live must die翻译下, Is living time must be joyful,because you must die are very 动词时态问题,动词是die,为什么句中用have died,不是have been dead 动词die 是点动词 为什么还有 现在分词 英语翻译Force must be loved.So if you want to die in order to gi i want tell you .the beautiful girl must be kind .the die 为什么是must be kept而不是must to be kept die的延续性动词 die,practise,must,would,shall的过去式咋写