《剑桥英语语法》 page 171写道:
【ib】 #The sun is setting at five tomorrow.
The progressive is restricted to cases where human agency or intention is involved – hence the anomaly of examples like [ib].
作者认为进行体表示将来仅限于涉及人的作用或愿望的情况下,因此【Ib】例句是错的。按此说法,It's raining soon.和 The sun is setting soon. 是否都是错的?
It's raining soon.错句。It's raining 只有在下雨时才这样用。但可以说It'll be raining soon. It will rain soon. 或It's going to rain.
The sun is setting soon. 正确。这属于客观状态描述,不是属于human agency. 和《剑桥语法》的例句不同,因为没有具体时间at five.
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