18. 張克禮編著《新英語語法》（第二版）（高等教育出版社 2005年1月第2版）P221: (5)表示條件，可取代條件狀語從句：

I should be delighted to join you/if I could join you.

He would have been foolish to do it/if he had done it.

不定式分句有時把條件和其它語義結合在一起，如目的、理由等：

You must be strong to lift that weight.

= You must be strong if you are able to lift that weight.

= You must be strong in order to lift that weight.

= You must be strong because you are able to lift that weight.

19. 趙振才編著《英語常見問題解答大詞典》(增訂版)(世界圖書西安出版公司2005年3月第1版)P684: 除了非真實條件狀語從句之外，還有許多語言手段來表達非真實的情況。動詞不定式便是此種手段之一。動詞不定式用作條件狀語時，它不是通過詞匯手段（如，if, as long as, provided等），而是通過語法手段來表示條件關系的。

You would do well to write more distinctly.(事實是：你寫得不清楚，動詞不定式to write more distinctly提出與事實相反的條件)

In fact, the nation’s first settlers would have been very surprised to see how Americans celebrate Christmas today. (VOA)事實上，要是美國最早的定居者看到今天美國人慶祝圣誕節的盛況，會感到十分驚訝。

P685：【問】I would have given much to have been able to call off the whole thing.(復旦大學等校編《大學英語》精讀4級一單元)

我們班很多同學將上面的句子理解為“為了能夠取消這件事，我寧愿做出很大犧牲”。不知這種理解是否正確？

【答】當看到主句中的would have given這一虛擬形式時，就應想到to have been able一定跟非真實條件有關。完成體不定式（to have been able）更能顯性地表示與過去事實相反的條件。上面句子的意思是：要是那時我能夠取消整個這件事的話，那我是多大的犧牲都愿做出來的。

20. [日] 綿貫陽等著《現代英語語法例解手冊》(修訂版))(申勇譯 科學出版社2006年2月第1版)P463:(5)表示條件。也用于虛擬語氣的句子結構。

To hear him talk, you would take him for a foreigner.

P539: You’d be crazy to expect that kind of thing to happen.(=If you were to expect that kind of thing to happen,…)

To hear him talk, you would think he was God Almighty. (=If you heard him talk, …)

21. 楊元興主編《英語句型大全》(上海外語教育出版社2007年3月第1版)P1037：不定式短語也可表示真實條件，但不常見。

I’ll thank you not to follow me (=if you do not follow me).

To survive (=If we are to survive), we must have food.

P1044:不定式短語表示非真實條件。

It would be easier to do it this way (=if we were to do it this way).

To look at him (=If you were to look at him), you could hardly help laughing.

To hear him speak English (=If one were to hear him speak English), one would take him for an Englishman.

22. 章振邦主編的《新編高級英語語法》（上海外語教育出版社2012年12月第1版）P514：

To look at him (=If you were to look at him), you would think him a young man.

One would be a brute not to feel for the sufferings of the black people in South Africa (=if he should not feel for the sufferings of the black people in South Africa ).

23. 劉永科主編的《高中英語語法全解》（陜西人民出版社2013年3月第1版）P191：

You would be a fool to refuse his offer.

=If you should refuse his offer, you would be a fool.

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