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1) He then asked Paul who did not know.
2) He then asked Paul,who did not know.

As far as I am concerned,the first sentence is associated with a restrictive relative clause,whereas the second one is associated with an appositive relative clause.Even though I know this,I cannot tell the difference between these two sentences regarding the meaning.I'm not a native speaker.For me,their meanings are totally the same.But I guess there must be a difference between them,even though it might be a slight difference.

Can you explain them for me? Thanks a LOT!!!
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"Hey Paul," I asked, "Who doesn't know about the happy hour after work today? I'll make sure they get invited."

I asked Paul who didn't know (about the happy hour.)

Me: "Hey Paul, what's the Celsius equivalent for 17 degrees Fahrenheit?"
Paul: "I have no idea!"

I asked Paul, who didn't know.
Comments  
1) He then asked Paul who did not know.

2) He then asked Paul,who did not know.

As far as I am concerned,the first sentence is associated with a restrictive relative clause,whereas the second one is associated with an appositive relative clause.Even though I know this,I cannot tell the difference between these two sentences regarding the meaning.I'm not a native speaker.For me,their meanings are totally the same.But I guess there must be a difference between them,even though it might be a slight difference.

Can you explain them for me? Thanks a LOT!!!
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 BarbaraPA's reply was promoted to an answer.
Hi Clarissa. Welcome to English Forums.

To clarify a little on relative vs. appositive clauses I recommend you follow the link:

http://www2.gsu.edu/~eslhpb/grammar/lecture_11/relative.html

Based on the analysis above I can put your clause only in one bucket - that being a relative one.

He then asked Paul who did it. (Paul here is a subject, a noun is attached to the clause. And a relative pronoun means the same thing - Paul).
Aargh... I see now. Context is what does wonders. Thank you, Barbara. Emotion: smile
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