Final answer:
The main verb in the sentence is 'feeling'.
Step-by-step explanation:
The main verb in the sentence 'Nathaniel is feeling much better now' is feeling. The subject of the sentence is 'Nathaniel' and the main verb 'feeling' shows the action that he is performing. It describes what Nathaniel is doing or experiencing in the present moment. In this case, the verb 'feeling' indicates the current state of Nathaniel, who is feeling much better.
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