gōng / jiàng / zhèng / zài / gěi / zhè / zuò / lǎo / fáng / zi / de / wū / dǐng / pū / yǎng / wǎ工匠正在给这座老房子的屋顶铺仰瓦。The craftsman is laying concave roof tiles on the roof of this old house.