食物壞了，不能吃了
最簡單常用的表達是
It's gone off.
If food or drink goes off, it is not good to eat or drink any more because it is too old.
(食物、飲料等)變質，變壞，腐敗
例：
This bacon smells a bit funny - do you think it's gone off?
這燻豬肉聞起來有點怪怪的——你覺得它是不是變質了?
It's spoilt.
spoil v. /spɔɪl/
When food spoils or is spoiled, it is no longer good enough to eat.
(使)(食物)變質，(使)變壞
例：
The dessert will spoil if you don't keep it in the fridge.
如果你不把甜點放在冰箱裡，它會壞掉的。
如果你實在想不出別的單詞，
腦子裡只有bad的話
也是可以表達的
只不過不能用be動詞
而應該用
go bad
但其實食物變壞，
也細分很多種
比如說“腐爛”就可以用到
rot
rot
v. /rɒt/
to (cause something to) decay
(使)腐敗;(使)腐爛;(使)腐朽
例：
The fruit had been left to rot on the trees.
水果無人採摘，爛在了樹上。
Rain has got in and rotted (away) the woodwork.
雨水漏了進來，使屋中的木建部分都朽爛了。
the smell of rotting fruit
爛水果的味道
由於成分不同，
不同的食物變質也會產生不同的化學反應，
比如粥會變餿。
“變餿”用英語怎麼說呢?
turn sour
sour可以形容食物腐爛泛酸味，變餿了
sour
v. /saʊər/
to become sour or to make something become sour
(使)變酸;(使)酸腐
例：
Hot weather sours milk.
熱天會讓牛奶變酸。
Milk sours in hot weather.
牛奶在熱天會變酸。
高溫和溼氣會給細菌滋生提供了生存環境，
食物容易發黴長毛
那食物“發黴”的英文表達是什麼?
go mouldy
發黴
mouldy
adj. /ˈməʊl.di/
covered with mould
發黴的
例：
mouldy bread/cheese
發黴的麵包/奶酪
These biscuits have gone mouldy,so I will buy some food in the grocery store.
這些餅乾發黴了，所以我會去雜貨店買點食物。
還有一種情況我們通常就不再吃這個食物了，
那就是它過了它的保質期
"It's past its Use-by date."
保質期
use-by date
best-before date
expiration date
這個三個表達之間的區別
Expiration dates tell consumers the last day a product is safe to consume. Best before date on the other hand tells you that the food is no longer in its perfect shape from that date. It may just lose its freshness, taste, aroma or nutrients. It does not necessarily mean that the food is no longer safe to eat. Best before date is basically a quality indicator. Another term that gets mixed up with this is the use by date which applies only to perishable goods such as fresh fish or meat. Dispose them off immediately once they have passed the use by date.
Expiration dates告訴消費者產品可以安全食用的最後一天。Best before date告訴你食物從那個日期起就不再處於最佳食用期了。它可能會失去它的新鮮，味道，香氣或營養。這並不一定意味著食物不再安全。Best before date基本上是一個質量指標。另一個與此混在一起的術語是use by date，它只適用於像新鮮的魚或肉這樣的易腐貨物。一旦過了use by date，需要立即將它們處理掉。
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