下述句子（見補充說明）中的should是什麼用法?難道should也可以表「可能」之意嗎?

題目：

下述句子（見補充說明）中的should是什麼用法?難道should也可以表「可能」之意嗎?
In the case of fine art,paintings,or jewelry,color photographs can sometimes be of assistance to the police should you be unfortunate enough to have them stolen.

解答：

1.此句中的should表示條件,翻譯爲「萬一」.
2.句中採用了if引導的條件狀語從句的虛擬語氣的倒裝語法.
即：should you be unfortunate enough to have them stolen
= if you should be unfortunate enough to have them stolen
3.相關語法規定如下：
1）if引導的條件狀語從句,如果使用虛擬語氣對將來的倒裝進行虛擬時,則if從句可以使用「should + 動詞原形」或「were to do sth」或「動詞過去式」來做謂語,主句則使用「would/could/might + 動詞原形」做謂語結構.
如：If it should rain tomorrow,I would stay at home.
= If it were to rain tomorrow,I would stay at home.
= If it rained tomorrow,I would stay at home.
2) 而且,如果if引導的使用了虛擬語氣的條件狀語從句,且其含有should/had/were時,則可以把這三個詞中任意一個提前至從句句首,並省略if.
如：If it should rain tomorrow,I would stay at home.
= If it were to rain tomorrow,I would stay at home.
= Should it rain tomorrow,I would stay at home.
= Were it to rain tomorrow,I would stay at home.