Spot the mistake! One sentence below has an error with gerund or infinitive use. Select the INCORRECT sentence.

🚌 Marco is adjusting to his new commute routine.

The correct answer is It's necessary studying every day for the exam.

This sentence is incorrect. In the pattern It's + adjective + to-infinitive, we must use to + base verb, not a gerund. The correct form is: "It's necessary to study every day for the exam."