1. only to do 的意思是"不料(却)……，结果(却)……",表示一个没有料到的结果。
I hurried to the supermarket, only to find it was closed.
我匆忙赶到超市,不料它已经关门了。
He made a long speech only to show his foolishness.
他讲了一大通，结果只是显露了他的愚蠢。
I went to see him, only to learn that he had left the city the night before.
我去看他，不料听人家说他已经在前夜离开这个城市。
2. only doing 的意思是"结果就……",表示一个意料之中的结果。
He died, only leaving nothing but debts. 他死了，结果只留下了一身债务。
He dropped the plate, only breaking it into pieces.
盘子从他手中掉下来，结果摔成了碎片。
He aimed, fired, only bringing down a red-necked bird.
他瞄准，射击，结果打下了一只红颈鸟。
