请问 We just be informed from APL 中 JUST后面为什么要加BE

We just be friends "just be be just just be just be glad you weren't living in medieval times.为什么just后面接 be here,just be we just want you to be happy 英语翻译Please be informed that I have just sent you an addition be informed 下面的句子中while后面为什么要加be, come from后为什么要加be "要勇敢."用英语说是"Just be brave."这句英语为什么要用"be"?为什么不说"Just brave.