丢 + 了 + Object / Subject + 丢 + 了
丢 (diū) means "to lose" or "to misplace" and is used when something has been lost, dropped, or gone missing. It is a common everyday verb, frequently paired with 了 to indicate that the loss has already occurred.
我昨天把手机丢了,到现在还没找到。
wǒ zuótiān bǎ shǒujī diū le, dào xiànzài hái méi zhǎodào.
I lost my phone yesterday and still haven't found it.
小心别把钥匙丢了。
xiǎoxīn bié bǎ yàoshi diū le.
Be careful not to lose your keys.
她在地铁上丢了一把伞。
tā zài dìtiě shàng diū le yī bǎ sǎn.
She lost an umbrella on the subway.