Yesterday a street-beggar bought a lottery ticket purposelessly, to make him a millionaire overnight.
本句用不定式，表示偶然的或出乎意料的结果。
1. 动词不定式作结果状语，表示偶然的或出乎意料的结果，有 only 时更加明显。
She hurried to the station, only to be told the train had gone. 她匆忙赶到车站却被告知火车已走了。
The old man lived to see his great grandson get married.这位老人活到看见他的曾孙结婚了。
She woke up in the night to find her dark room lit by flashing lights.她夜里醒来，发现黑暗的房间被闪烁的灯光照亮了。
注：不定式的逻辑主语是句子主语。
2. 现在分词表示结果，往往是自然而然的或必然的结果。
The fire lasted nearly two days, leaving nothing valuable. 大火持续了将近两天，没剩下有价值的东西。
My grandpa fell off the bike, breaking his right arm and leg. 我爷爷从自行车上掉下来，摔断了右胳膊和右腿。
It has rained for over ten days, causing the river to rise. 下了十多天雨，致使河水上涨。
He didn’t pass the exam, making his parents quite disappointed. = He didn’t pass the exam, which made his parents quite disappointed.
注：现在分词的逻辑主语是整个前句，相当于which 引导的定语从句。
