Prepositions ususally stand before nouns, in this case "on" is the preposition.
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Options C and D feature parallel structure.
Parallel structure occurs when the same grammatical pattern is used. In options C and D, the same grammatical pattern is used in each: both are questions, and both begin with a verb followed by the subject.
Answer:The subject is the actor of the sentence, the person or thing doing the action. The verb is the 'doing word', the action of the sentence. The object is the element of the sentence that is acted on, that the verb is directed towards.
Explanation:A subject is a part of a sentence that contains the person or thing performing the action (or verb) in a sentence. ... In the sentence, the subject is "I" and the verb is "will call." Example: You were a great singer. In this sentence, the subject is "you" and the verb is "were."
Phrases are groups of words that act as a part of speech but cannot stand alone as a sentence. ... Clauses are groups of words that have a subject and a predicate. Independent clauses express a complete thought and can stand alone as a sentence.
