A：Is this watch yours?
这是你的手表吗?
B：No, it isn't mine. I blundered upon it under the sofa. Do you know whose watch it is?
不，不是我的。我是在沙发下面捡到的。你知道是谁的吗?
A：Let me have a look. It's mine. I have been looking for it, but just cannot find it. It's present from my father.
让我看一看，这是我的手表，我一直在找它就是找不到。这是我父亲送给我的礼物。
B：Well, here you are. Remember to put it in a proper place.
哦，给你吧。记得把它放好。
注释:
1.blunder是动词，意思是“犯错误，乱闯，瞎闯或者是碰到某物”，短语blunder upon指的是“偶然碰上或者是无意中发现”。
2.put sth in + adj. Place：把......放在......的地方
3.have a look：看一看，看一下
4.look for：寻找
5.a prensent from sb：某人送的礼物
6.under the sofa：在沙发下面
7.a proper place：合适的地方