Bhai.1. There are many nice people in the party.
2. There are many nice persons in the party.
a. Do people and persons mean the same in the above sentences? Yes, they do, but you will rarely hear "persons".
b. Are the above sentences in correct structure? We would usually say "at the party".
c. There is no plural form for people. Am I right? That's right.
d. There is plural form for person. Am I right? Yes.
Student or Learner