I'm not sure this is a productive approach. Just because you can take a group of words (a phrase) which has some meaning to the average native speaker, and can then add words at your discretion to grow it into a legitimate clause, does not mean that the phrase derives from that clause. Of course there are phrases which the grammatically aware native speaker will thoughtfully admit are ellipsis, but to approach all phrases which are not clauses in this way would be a gross oversimplification.
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English 1b3What are the bolded words? A phrase? If so, what single part of speech is it?The bolded words are a clause from which a few words have been omitted -- not just a phrase. The missing words are easily recoverable from the preceding clause.
There were two beds in the room, one at each end of the room.