Dinner will be ready in 20 minutes 请问这句子中的“be”是什么意思、怎么理解?

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Dinner will be ready in 20 minutes 请问这句子中的“be”是什么意思、怎么理解?
那这个“be”可以改成其它句子一样用"are"或“is”放在这个句子里吗？

eady是形容词,如果缺少be,句子就缺少了谓语.而be是系动词,作为系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语,亦称补语（形容词）,构成系表结构说明主语的状况、性质、特征等情况.
be ready 的意思是准备好.

Dinner will be ready in 20 minutes 请问这句子中的“be”是什么意思、怎么理解? "why?Do you think that dinner will be ready in five minutes? 副词 Dinner will be ready…… but i can be ready to go for dinner with you in five minutes 完成句子（10分）1. When will the dinner be ready? I’m s________.2. Dinner isn't teady yet._______ will it be ready? ----will the dinner be ready I‘m hungry now. If the bus be on time ,it will be here in ten minutes 中的be用什请问“i will be running 15 minutes 请教这句I will be back in five minutes I will be back in five minutes. We will be back in ten minutes.