The teacher is to go to Beijing tomorrow.为什么可以用be to go表示将来时

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The teacher is to go to Beijing tomorrow.为什么可以用be to go表示将来时
可是答案里还有一个is about to go 的选项啊

4. be to+动词原形,表按计划,安排即将发生的动作.
I’m to have tea with Tom this afternoon.
这种结构一般用于正式语体.一：常见于报纸和广播,用以宣布官方的计划或决定；二：表命令•禁止或可能性等.
一：The Queen is to visit Japan next year.
二：Tell her she’s not to be back late.
5: be about to+动词原形,常用于过去式,表最近的过去将来,在一定的语境中常指未曾实现的意图.
We were about to go out, when it began to rain.我们正要出去,却下起了雨.

have to 可以表将来时的吗?例：I have to go to school tomorrow. be going to 是一般将来时的标识,而且还可以表示 go 的将来时. _____she____(go)to Beijing tomorrow? 用be going to do 表将来时的时候,表示购物是going to go shopping吗?这么麻烦? He wants to go to Beijing tomorrow to go to Beijing tomorrow be off to 可以用于将来时吗?she ______ London tomorrow.为什么答案是 is off i will go to beijing the day after tomorrow He is going to go to Beijing by train tomorrow 对Beijing提问 when is the best time to go to Beijing? Fall is the best time to go to Beijing是什么意思 She will/is going to plan to go to Beijing tomorrow.的同义句 Beijing is the best place to go on vacation 还是to go to on va