my watch -----,i can not find it .线上该填is missing 还是is lost 还

e lost 是“丢了”的意思
lost 是 lose 的过去式和过去分词
但在这里的 lost 是形容词,做形容词时就用 be lost
形容词：
1.弄丢的,遗失的
The lost ring was never found.
遗失的戒指再也没有找到.
2.迷途的
He took the lost child to the policeman.
他把迷路的小孩领到警察那里.
3.逝去的;丧失的
She felt great grief over her lost youth.
她对逝去的青春感到极大的悲伤.
4.错过的;浪费掉的;输掉的
We must make up for the lost time.
我们必须弥补失去的时间.
5.灭亡的;被破坏的;死的
That ship and all hands on board were lost on the reef.
那条船连同全体船员都触礁遇难了.
6.未注意的;漠视的[F][(+to)]
He was reading a novel,completely lost to the world.
他在读一本小说,对周围的事毫无感觉.
7.无影响力的[F][(+on/upon)]
Your kindness is not lost upon me.
做动词时
及物动词 vt.
1.失,丢失,丧失
Carl's father lost his job last month.
卡尔的父亲上个月失业了.
2.使失去[O1]
A bad cold had lost me some time.
一场重感冒使我失去了一些时间.
3.输去;未赢得
He has lost his case.
他的官司打输了.
4.损失(金钱)[(+on)]
We lost a lot of money on that deal.
我们在那笔交易上亏损了许多钱.
5.迷失;使迷路
She got lost in the forest.
她在森林里迷了路.
6.听不见;看不见;抓不住;错过
She had to walk to the station and so lost her train.
她只能步行去车站,因而没赶上火车.
7.浪费,白费
Louise lost no time in returning to Cincinnati.
路易丝没有耽搁,马上回到辛辛那提.
8.使沉湎于[(+in)]
The boy soon lost himself in the book.
这男孩不久便专心地看起书来.
9.使迷糊不清
10.(钟表)慢
My watch loses a minute a day.
我的表一天慢一分钟.
不及物动词 vi.
1.输掉,失败[(+by/to)]
Cambridge lost to Oxford.
剑桥队输给了牛津队.
2.受损失;赔钱[(+on)]
We lost on that transaction.
我们在那笔交易上赔了钱.
3.(钟、表)走慢
Your watch is losing.
你的表走慢了.
missing 不见了 = gone\lost
My wallet is missing\gone\lost.我的钱包不见了,丢了.
lose 动词 意思：遗失
My book is lost.我的书弄丢了.
losing can be painful.“失去”是痛苦的.
用这个词一般带有遗憾和意外的意义.并且是不知道东西具体在哪里遗失的情况下用的.
在你这个例句里,is missing 和is lost 都可以,丢了是现在的状态,现在还是“丢了”,强调现在的状态,用一般时态就行,并且后半句也是用的现在时态啊.没有涉及到过去完成什么事,不用has.
这句话可能让你弄不清它的词性,这句话的lost是形容词,弄丢的,遗失的.