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1·She could be dead for all I know.

她说不定已经死了。《牛津词典》

2·For all I know she's still living in Boston.

据我所知她还住在波士顿。《牛津词典》

3·For all I know, there may be a kernel of truth in what he says.

据我所知，他的话可能有一点儿道理。《柯林斯英汉双解大词典》

4·He may be dead, for all I know.

据我所知，他是山姆的死党。

5·Unheard of for all I know.

我根本没听说过。

6·For all I know, he is going to retire.

就我所知，他准备退休了。

7·He might be in the library for all I know.

就我所知，他可能在图书馆。

8·For all I know, he may have left for Canada.

就我所知，他可能已去了加拿大。

9·He might have left for Europe for all I know.

据他所知，他可能是去了欧洲。

10·For all I know, he may have leave for France.

就我所知，他可能已去法国了。