Sentence 1, “Enrollment is now on going,” is grammatically incorrect but both Sentence 2, “Enrollment is now going on,” and Sentence 3, “Enrollment is now ongoing,” are grammatically correct.
Sentence 1 suffers from bad syntax and bad semantics because the word order of the phrase “on going” is inverted, making the sentence nonsensical.
Sentence 2 correctly uses the present tense progressive form of the intransitive verb phrase “go on” that means “continue,” while Sentence 3 correctly uses the one-word “ongoing” as an adjective that means “continuing” or “being actually in process.”
