Question form
Adverbs like always come before the main verb (study, arrive) in questions as well as in statements. With forms of be (am, is, are) the adverb of frequency remains with the rest of the predicate when the verb is put before the subject to make a question.
#1 Before main verb.
-John always studies at night.
Does John always studies at night?
-You usually eat lunch at noon.
Do you usually eat lunch at noon?
-They sometimes read at night.
Do they sometimes read at night?
#2 After forms of be.
-Mary is always busy.
Is she always busy?
-Pencils are usually light.
Are they usually light?
-You are sometimes tired.
Are you sometimes tired?