tā / yí / jiàn / dào / lǎo / péng / you / jiù / kāi / shǐ / xī / xī / hā / hā / de / liáo / tiān

他一见到老朋友，就开始嘻嘻哈哈地聊天。

As soon as he saw his old friend, he started chatting and joking happily.