Charles E. Sprague, Hand-book of Volapük — 20 (1887)
“ THE FREQUENTATIV FORM OR AORIST When a verb refers to the habitual performance of an action, this may be indicated by adding the letter i (pronounced as a separate syllable) to the tense augment. Thus, In English we have no special form for habitual action , but, on the other hand, we use the verb to be with the participle in -ing to express action continuing temporarily. ”
