happen to do sth.是固定词组颂猜启，“碰巧做某事”的野如意思 I happened to sit by her in the cinema.在电影院我碰巧坐兆帆在她旁边。 meet up with 则通常指
该短语应该是sb, "某人碰巧做某事
happened to do 是 happen to do 的过去式，意者腔世思首肢没有圆历差别
I happened to meet him in the park this morning
happen to do 碰巧做。。happened to do应该是过去时形式
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