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“so+adj. / adv.”位于句首时的倒装，副词so后接形容词或副词位于句首时，其后用部分倒装：
1. So cold was the weather that we had to stay at home.
天气太冷，我们只好呆在家里。
2. So fast does light travel that we can hardly imagine its speed.
光速很快，我们几乎没法想像它的速度。
3. So sudden was the attack that we had no time to escape.
袭击来得非常突然，我们来不及逃跑。