这句英语的语法怎么解释呢they were unaware of the fate that was to befall them

问题描述:

这句英语的语法怎么解释呢they were unaware of the fate that was to befall them
that was to befall them的was to 麻烦举例跟我解释一下,

他们没有意识到将会降临到他们头上的厄运.
is to的例句:A good game is to destroy an incompetent publishers