Many plans to leave the party before it ends.The sentence is correct as written.Change “plans” to “plan.”Change “Many” to “Most.”

“Many” can be a plural pronoun meaning many people, and it needs a verb. Changing “plans” to “plan” gives the sentence a subject and verb: “Many plan to leave the party before it ends.” As written, “Many plans” is a noun phrase without a main verb.

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