10. 何桂金編著《英語動詞新編》(重慶大學出版社 1996年7 月第1版)P247: 7)修飾整個句子表示條件。例如：

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

To look at him (If you looked at him), you could hardly help laughing.

11. 張道真編著的《英語語法大全》上冊（外語教學與研究出版社1998年8月第1版）P711:

I should have been very pleased to have been present.

The servant would not have quitted to have been better treated.

12. 秦裕祥著的《英語語法專題研究》（湖南師范大學出版社 1999年5月第1版）P180：不定式表示想象性條件，主要用于表示說話人的假設。例如：

To hear him talk, you would think he owned the whole world.

A man would be blind not to see that.

To judge be her reaction, she must have deeply resented your remarks.

不定式表示的條件多為非真實條件，但有時也可見到不定式表示真實條件的的情況。如它用于表示說話人主觀設定的條件或與目的的意義相混雜的條件時即是如此。

You do an honest man wrong to call him a liar or a thief.

You have to be strong to lift a table like that.(筆者注：此句可參考18. )

To make other comfortable, you have to appear comfortable yourself.

13. 徐廣聯主編的《大學英語語法講座與測試》(第二版)(華東理工大學出版社 2000年)P569: 6) 表示條件 動詞不定式有時也可以表示條件。一般置于句首，否定不定式多置于句尾。例如：

To look at her, you would think her a young woman, but she is in fact 47 years old. (= If you were to look at her)

One would be careless not to see the mistakes. (=if one should not see…)

You couldn’t do that to save your life.

I should have been sorry to have missed the chance.

14. 張滿勝編著《英語語法 新思維高級教程：駕馭語法》(世界知識出版社 2002年4 月第1版)P200: 3. 用作條件狀語

You would be stupid not to ask for a raise.= You would be stupid if you don ‘t ask for a raise.

I would be very happy to be invited to the party.=… if I had been invited …. But I wasn’t invited.

15. 薄冰編著《高級英語語法》最新修訂)(世界知識出版社 2002年10 月第8次印刷) P295: 5)不定式偶爾亦可表讓步或條件。如：

To look at him you could hardly help laughing.

A man would be blind not to see that.

16. 賀立民編著《賀氏英語語法全書》(中山大學出版社2003年2月第1版)P764: 15.表示“條件”——相當于一個 if-clause。如：

To hear you sing, people might take you for a girl.= If people heard you sing, they might take you for a girl.

17. 王國棟編著的《大學英語深層語法》(清華大學出版社 2005年1 月第1 版)P334：條件狀語：通常置于句首，用逗號隔開。如：

To hear him speak, you would think he owned the whole world. = If you should hear him speak, you would think he owned the whole world.

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