Take another look at the sentence:

Josh neglected not only to thank Solita, but he also gave a sip of orange soda to Reva, Solita's rival.

When you use not only ... but also, you must have two equal grammatical items. After not only, notice that you have an infinitive phrase, to thank Solita. But after but also, you have a main clause, he gave a sip of orange soda to Reva. The structure is not parallel.

To fix the problem, you should start the sentence with Not only did Josh neglect to thank Solita.

Go to the next sentence.

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