词原形 3.If＋主语＋should＋动词

　　原形 主语＋should/would/could/might＋动词原形

　　在条件状语从句中可省略if，把were, had, should提到句首，变为倒装句式。 If it should rain tomorrow, we would not go climbing. →Should it rain tomorrow, we would not go climbing. 如果明天下雨的话，我们就不去登山了。 注意：当省略的条件状语从句中的谓语动词是否定形式时，不能用动词的缩略形式。

　　有时为了表达的需要，在虚拟语气中并不总是出现if引导的条件状语从句，而是通过其他手段来代替虚拟条件句。

　　1.

　　if省略句 2．含蓄条件句

　　but...(真实) If you had not helped me, I would have failed. ①Without your help, I would have failed. ②But for your help＝If it had not been your help ＝Had it not been your help I would have failed.

　　3．高考考查与过去相反 ③But that you had helped me, I would have failed. ④You helped me. Otherwise, I would have failed. ⑤You helped me, or/or else I would have failed. ⑥I would have failed but you helped me.

　　(上海卷)It is hard for me to imagine what I would be doing today if I ________in love, at the age of seven, with the Melinda Cox Library in my hometown. A．wouldn't have fallen

　　B．had not fallen C．should fall

　　D．were to fall 答案　B　[考查虚拟语气错综复杂句，从句与过去相反假设。]

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