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Hi,

After reading all your answers, I have some questions again:

1/ In "Some man was there." , some man is used to refer to a man about whom the speaker knows absolutely nothing -- not even the name.

So, in "A certain man was there." Is a certain man also used to refer to a man about whom the speaker knows absolutely nothing -- not even the name or to refer the man whose name is known but not stated or sth else?

2/In "While you were out, some Mr. Smith called for you", what does

some Mr. Smith mean? Is some Mr. Smith used to refer to a man about whom the speaker knows only the name? (Has the speaker just known the name via phone ?).

In "While you were out, a certain Mr. Smith called for you", what does

a certain Mr. Smith mean? Is a certain Mr. Smith also used to refer to a man about whom the speaker knows only the name? (Has the speaker just known the name via phone ?) or something else?

Q
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Hi Tung,

This looks very much like an earlier query that I responded to. It's hard for me to see what new question you have.

Best wishes, Clive
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Yes, I see:
some and certain
quite clarifies the matter.

And again:
some=unspecified
certain=particular
don't mean the same.

Read the meanings of some/unspecified and certain/particular in a dictionary in your own language, perhaps this helps.

Also, see:
http://www.bartleby.com/61/39/C0213900.html