many students study at our institute this years
Общий:
Do many students study at our institute this year?
Специальный:
Why do many students study at our institute this year?
К подлежащему:
Who studies at our institute this year?
Альтернативный:
Do many students study at our institute or at school this year?
Разделительный:
Мany students study at our institute this year, don't they?