“不定式”作后置状语的举例

1)She was so angry as to be unable to speak.（她气得连话都说不出来了。)

2)I don't know her well enough to ask her for help.（我与她不太熟悉，不便请她帮忙。)

3)She was too angry to say anything.（她气得什么都说不出来了。)

4)I'm only too glad to help you.

注意与例3)的区别：only too与happy,pleased,glad 等词使用时，表示“非常”：我非常愿意帮助你（能帮助你真是太高兴了)

5)We waited in the train for nearly three hours,only to be told that the appointment had been canceled.（only to…表示意想不到的结果：我们在雨中等了近3个小时，结果被告知约会取消了。)

6)To be fair,he has been working very hard recently.（公平地说，他最近工作一直非常努力。类似的表达方式还有：

to tell the truth（说实话),to be frank（老实说),to go without saying （不用说 / 毫无疑问)等。