Here are the answers to the given words underlined in the sentences above:
1. Sign is used as a predicate nominative.
2. The word empty is used as a predicate adjective, describing the noun basement.
3. The word Mom is used as an indirect object. The direct object is the copy of the year book.
4. The word dog in the sentence is used as a predicate nominative.
5. The word disappointment is used as a predicate adjective that describes the noun performance.
The answer would be “plain folks”
prepositional phrase = "in Spain"
usage: adjective
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C) cover the main points of the material he has read