Planes will be very large so flying will be very cheap为什么Will 后面要用be?去掉不行吗?我一直很困扰,还有别的句子也有类似的,感激不尽（越详细越多分）

be 是系动词 也是动词啊
去掉句子没有动词还是句子吗？！...

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飞机将会被造得很大,这样坐飞机出行就会变得很便宜了
be 不可以去掉的.英文句子有动词的就这三种：
主+谓+宾 或者是 主+系+表 或者是 主+谓+副词.这是主要的架构.少“主”的话,可以理解为“祈使”或者“希望”.少“谓语”,或者“系动词”的话,句子主残缺不全了.Will 属于情态动词,必须放在谓语动词或者系动词之前的.没有单用情态动词而不用谓语或者系动词的用法.
简单例句：
一、 主+谓+宾
1、I have a pen.我有支笔.
2、I will have a pen.我将有支笔.
3、Have a pen,please.弄支笔来!
二、主+系+表
4、I am a kind man.我是个好人.
5、I will be a kind man.我将是个好人.
6、Be a kind man,please!做个好人吧!
三、主+谓+副词
7、I run fast.我跑地快.
8、I will run fast.我将会跑地快.
9、Run fast,please!跑快点!