He ... (always/bite) his nails.

He always bites his nails. (Present Simple).

He does not always bite his nails. (negative).

Does he always bite his nails? (General question).

Who always bites his nails? (Special question).

What does he always bite? (Special question).

What does he do? (Special question).

Does he or do you always bite his nails? (Alternative question).

Does he always or usually bite his nails? (Alternative question).

Does he always bite or cut his nails? (Alternative question).

Does he always bite his or her nails? (Alternative question).

Does he always bite his nails or fingers? (Alternative question).

He always bites his nails, does not he? (Disjunctive question).