expiry date show on the pack

expiry date shown on the pack --
shown 至0岩

show 係一個動詞, active voice:
I show you the expiry date on the pack 就0岩

如果變 passive voice 就會用 past participle:
You are shown the expiry date on the pack

以上都是句子，不過expiry date shown on the pack 就係一個phrase (fragment). [不是整句句子哦!] 但呢個 phrase 係0岩既 (如果正確組落一句句子度)
expiry date (名詞) "shown on the pack" (adjective phrase), 形容名詞用

有興趣可以查下 "past participle" 既用法!