The adverb is "upstairs" as it explains wherethe collection was kept.
Well an adverb describes a verb, so upstairs is the adverb, and in the sentence it modifies the verb keeps.
A bauble is a small, decorative trinket. An example sentence would be: She keeps her bauble collection on the tall shelf.
The adverb clause in the sentence is 'if we sell our house.' An adverb clause contains a subject and verb, a subordinate conjunction that keeps the phrase from containing a complete thought, and answers the question of how, when, or why.
Winter is a hectic season for many people, but that is what keeps it fun.
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The effective stress analysis refers to the force that keeps the collection of the particles rigid.
A subordinate clause has a verb and another sentence within it.../././././././././.
He keeps "his unanswered correspondence transfixed by a jack-knife into the very centre of his wooden mantelpiece" ('The Musgrave Ritual'). There is no mention of where he keeps his answered mail though I suspect it would be packed in one of the upstairs lumber-rooms.
The effective stress analysis refers to the force that keeps the collection of the particles rigid.
government keeps our community safe
An apple a day keeps the doctor away.
The force of gravity is what keeps us on the ground.