分倒装。

　　Should it rain tomorrow, we would have to cancel the football match.

　　＝If it should rain tomorrow, we would have to cancel the football match.

　　如果明天下雨，我们将不得不取消足球赛。

　　-Helen, are you going to the airport to see Jack off the day after tomorrow?

　　-Were he toleave tomorrow, I would go. (＝If he were toleave tomorrow, I would go.)

　　--Helen, 后天你会去机场送Jack吗？

　　--如果他明天走的话，我就去送。

　　[即时演练3]

　　(1)单句语法填空

　　①(2014·福建高考改编)Were (be) there no modern telecommunications, we would have to wait for weeks to get news from around the world.

　　②Had I had time, I would have walked round that lake then.

　　(2)把下面的句子改为倒装句

　　①If he should be free tomorrow, I would talk with him.　

　　→Should_he_be_free_tomorrow,_I_would_talk_with_him.

　　②If I were you, I would give him a hand.

　　→Were_I_you,_I_would_give_him_a_hand.

　　二、虚拟语气在宾语从句中的应用

　　1．用在wish之后的宾语从句中

　　wish后的宾语从句使用虚拟语气，表示不能实现的愿望。

主句 用法 从句谓语动词的形式 主语＋wish 现在不能实现的愿望 用一般过去时(be通常用were) 过去不能实现的愿望 had＋过去分词 将来不能实现的愿望 would (could)＋动词原形 　　I wish I were a bird flying in the sky.

　　我希望我是一只在空中飞翔的小鸟。

　　I wish he had visitedus last night.

　　我希望他昨晚来看望我们了。

　　He wishes he could become a scientist someday.

　　他希望将来的某一天，他能成为科学家。

　　[即时演练4]　用所给词的适当形式填空

　　①(2015·天津高考改编)I wish I had_been (be) at my sister's wedding last Tuesday, but I was on a business trip in New York then.

②(2015·陕西高考改编)Ellen is a fantastic dancer. I wish I danced (dance) as well as her.