In the sentence, 'It was raining' what are the core arguments? I think [It] is a core argument and [was raining] is another. This would mean that it is a NP and was raining is a VP. But if this is the case, then what type of argument (subject, direct object, indirect object, oblique) is was raining ? Would raining be a dependent of was?

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    You might want to say what theoretical framework you're assuming, because the answer depends on assumptions about e.g. what an "argument" or "core argument" is. It's unlikely that "was raining" would be any kind of argument, but maybe it is in some theory.
    – user6726
    Oct 23 '15 at 0:55
  • I don't know what "core argument" means. "Was raining" is a predicate, not an argument.
    – Greg Lee
    Oct 23 '15 at 1:19