Поставьте глагол в скобках в Present Simple Tense. Those students never (to fail) the exams.

Those students never fail the exams.

Те студенты никогда не проваливают экзамены.

Do those students never fail the exams?

Do those students never or always fail the exams?

What do those students never fail?

Which students never fail the exams?

Who never fails the exams?

Those students never fail the exams, do they?