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 引用自 http://englishhome.org/were-to.html

“Were to" 用於過去的情況

句型

If … were to have + P.P. …, …

用法

“Were to" 可用於過去的時間來強調此條件句所述的情況極不可能或完全不可能發生或非常可怕 (讓人不敢再想下去)。注意：這種特殊句型只用於 if 子句。

例句：

• If the fire were to have destroyed the building, it would have been a tragic cultural loss. (如果大火燒毀了那棟建築，那會是一項不幸的文化損失) － 一想到這樣的損失就覺得很可怕，不敢再想下去。
• If the dam were to have burst, the entire town would have been destroyed. (如果水壩潰決，整個城鎮都會被摧毀) － 這樣的破壞太可怕了，讓人不敢想像。
• If Teresa were to have failed the final test, she would have lost her scholarship. (如果泰瑞莎未能通過期末考，她就會失去她的獎學金) － 泰瑞莎是個優秀傑出的學生，所以她不會通過期末考是極不可能發生的事。