gone：「丟了, 沒了」, 一去不復返，可以委婉表達「死了」；不能作定語。
Her fever is gone, but still coughs.
她已經燒，但是還咳嗽。(作表語)
-- Oh！ It is gone！Where is the rabbit？
哎呀，沒啦！兔子呢？（作表語）
The bad past is gone.（作表語）
糟糕的過往，一去不復返了。
lost：「丟失」，難以找回；
I lost my puppy.
我的小狗丟了。
Dreams of finding the lost treasure almost came true.
找到丟失的寶藏的夢想差點實現了。
lost 表示迷路：
He doesn't know London very and he lost his way.
他對倫敦不熟，迷路了。
missing：「不見了」，強調不在原處了。
The money in the cafe has gone missing.
保險柜裡的錢不見了。
She called the police after finding the gold missing.
發現黃金丟失之後，她報了警。
(1) _______ time will never be back again.
(2) Someone had told the police that his child was _______ .
(3)The old days are _______ forever.
文 / 陳德永