虛擬語氣在英語中經常用到，更是各種考試中的考點，因此，學好虛擬語氣對於學習英語來說尤為重要。虛擬語氣的常規形式相信大家都已經掌握，今天給大家介紹幾種特殊形式。
1 介詞短語引發虛擬語氣
介詞短語如： without, in, under, but for 等可引發虛擬語氣。
例：Under more favorable conditions, the production would have gone up more rapidly.
要是條件更好一些的話，產量會增加得更快。
2 分詞短語引發虛擬語氣
例：Born 5 days earlier, the girl could have seen her grandmother.
要是早出生5天的話，小女孩就會看到她奶奶了。
3 動詞不定式短語引發虛擬語氣
例：To hear Xiao Wang speak English, you would take him for an Englishman.
要是你聽到小王說英語，你就會把他當成英國人。
4 形容詞引發虛擬語氣
例：A brave man wouldn’t do such a thing.
要是一個勇敢的人就不會做這樣的事了。
5 名詞+and結構引發虛擬語氣
例：One step further and you could have made it.
你要是再堅持一下，就會成功了。
6 獨立主格結構引發虛擬語氣
例：All things considered, the price would be reasonable.
7 定語從句引發虛擬語氣
例：Anyone who had bee in your position would have helped him.
8 以suppose, say 開頭引發虛擬語氣
例： Say we paid them in advance, would they do the job?