CWhen asked later, if he thought he had made the right decision, George smiled and nodded.
I need the reason of putting the part between commas. Is that an appositive or no it has another reason?
It has nothing to do with apposition.
When asked later is a clause or phrase? I know what a phrase or clause is but here it dosen't have a subject. That is why I have a problem.
First of all, that's a clause. Secondly, a clause doesn't need to have a subject. This is a participle clause and it's subject is decided by the independent clause (or better said sentence) that comes after it.
I believe it's wrong to put the first comma in the sentence. The 'if' clause is part of 'when asked later'. We can't separate them. Some examples:
-Studying for five hours, he was terribly tired = he was terribly tired, because he had studied for five hours.
-When asked later, if he thought he had made the right decision, George smiled and nodded = when George was asked later if he had made the right decision, he smiled and nodded.
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