........................................(you study) English next year?

1. The sentence is a question about a future plan.

2. The structure for 'be going to' questions is: Wh-word + am/is/are + subject + going to + verb? (Here, the 'Wh-word' is implied, and it's a yes/no question).

3. Therefore, the answer is: Are you going to study English next year?