Hello, itxp—and welcome to English Forums. I'm sorry, but I do not understand your concern. 'Often' is in a natural position after the first element of a verb phrase (' are often expressed').
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itxpThere "usually" is common simple adverb using BEFORE the verb. But the second part of adverb "in morning" is composite and so it placed AFTER the verb.That is the general guideline, yes.