英语中各种各样的条件句(9)

2. Had 主语 谓语（动词），部分倒装，对应于 if 的第三类条件句，例如：
Had I known you were waiting outside, I would have invited you to come in.
如果我知道你在外面等，我会邀请你进来的。
解析：前半句相当于 If I had known you were waiting outside.
Had Margaret realised she would be travelling alone, she would never have agreed to go.
如果玛格丽特意识到她将独自旅行，她决不会同意去的。
解析：前半句相当于 If Margaret had realized she would be travelling alone.
3. If … were to，用于谈论可能发生但被认为不太可能发生的事情，在更正式的场合用倒装结构 Were 主语 to， 例如：
与现在相反：
If she were to be rich, she would be horribly obnoxious.
如果她有钱的话，她会很讨厌的。
If I were to have no friends, who would I spend my time with?
如果我没有朋友，我会和谁在一起？
If Nathan were to be my boss, this job would be intolerable.
如果内森是我的老板，这份工作将无法忍受。
与将来相反：
If I were to lose my job next year, I would probably not find a new one quickly.
如果我明年失业，我可能不会很快找到新工作。
If he were to fail his driving test tomorrow, he would have to take it again.
如果他明天驾驶考试不及格，他就得再考一次。
If Sarah were to show up late to the birthday party, it would ruin the surprise.