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The dress, covered in beads and sequins, was beautiful.
It is easy to make the mistake of writing this sentence so that the verb agrees with beads and sequins because these words are closest to the verb. This is not the subject of the sentence, however. The subject of the sentence is the dress, and the correct verb form is singular: was. Remember, the items listed within the commas, beads and sequins, don't affect the dress, ehich remains singular.
What is The dress, covered in beads and sequins, were beautiful.