Word order may be inverted (referred to in Tagalog grammar as "Kabalikang Anyo") by way of the inversion marker '"ay" ' (" ’y" after vowels in informal speech, not usually used in writing). Contrary to popular belief, this is not the copula 'to be' as '"ay'" does not behave as an existential marker in an SVO structure and an inverted form VSO does not require "'ay'" since the existentiality is denoted by case marking. A slight, but optional, pause in speech or a comma in writing may replace the inversion marker. This construction is often viewed by native speakers as formal or literary.