happen on/upon 偶然发现，偶然相遇
happen to sb./sth. 遭到，遇到
happen to 碰巧，正好
hardly…when… 刚……就……, 一……就……
have a connection with 和……有关/联系
have a fever 发烧
have a gift for 有……的天赋
have a good time(in) doing sth 做某事很开心
have a hand in 参与, 沾手
have a hard time(in) doing sth 做某事很辛苦
