说明:该结构也可用于条件状语从句。如:
If Im to be there on time, I must leave at once. 如果我要想准时赶到那儿,我就必须马上动身。
If we are to succeed in this enterprise, we shall need to plan everything very carefully. 如果我们想要在这项事业上取得成功,我们就需要把一切都仔细计划好。
另外,若表示过去未曾实现的想法或意图,其中的不定式则用完成式。如:
We were to have gone away last week, but I was ill. 我们本打算上周走的,但是我病了。
I was to have started work last week, but I changed my mind. 我本该上周开始工作的,但我改变了主意。
比较:
He was to go. 当时他是要去的。(至于最后去没去,不得而知)
He was to havegone. 他本来是要去的。(但实际上却没有去)
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