Rapid is an adjective its function is to describe nouns.
It can be in the subject position: The rapid train saves a lot of time.
It can be in the object position: I caught the rapid train to Zurich
Rapid in a sentence functions to make a fast sensation. For example, he drove rapidly over the bridge.
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She threw the eggs at such a rapid pace that I couldn't get out of the way of any of them.
The Industrial Revolution was a rapid change in the economy!
The professional boxer overwhelmed me with his rapid-fire punches.
The boy rapidly threw the ball. Except that's "rapidly". A use of "rapid" would be, "The rapid current carried away my pocketwatch."
A word functions in a sentence to convey meaning and contribute to the overall structure and coherence of the sentence. It serves a specific role such as a subject, verb, object, or modifier to help communicate the intended message effectively. The function of a word helps determine its position and relation to other words in the sentence.
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There is no subject complement in this sentence. In this sentence "felt" is a transitive action verb with "pulse" being a direct object, receiving the action of the verb.To have a subject complement in the sentence, "felt" would have to function as a linking verb. Example: The patient's pulse felt rapid. (In this case "rapid" is a predicate adjective describing the subject "pulse"; "rapid" is the subject complement.)
Our lightrail is a good form of rapid transit.
Due to the rapid water and uncertain depth of the river, I was not sure that I could ford the river.
The car accident seemed minor, but the rupture of his spleen caused the driver's rapid demise.
To determine the class word in a sentence, you can look at the function of the word within the sentence. Class words are typically nouns, verbs, adjectives, and adverbs. Identify the role the word plays in the sentence to determine its class.