be to do是是一般将来时。
be to do表将来
这种结构表示计划中约定的或者按职责、约定必须要做的事。
例句
They would be ill-advised to do this.
他们这么做是不明智的。
How long hell be able to do so is a moot point.
他还能这样做多久是一个未知数。
We were rather hoping you'd be able to do it by Friday.
我们希望你最好能在星期五之前做这件事。
Actually, it would be much more sensible to do it later.
事实上，以后再办这件事可能要明智得多。
She seemed to be unable to rouse herself to do anything.
她似乎打不起精神做任何事情。
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