whether (when a verb of seeing or trying is the main verb in the apodosis; or when sī is used twice correlatively)
Tính thường xuyên
Phát âm là (IPA)
[ˈsiː]
Từ nguyên (Tiếng Anh)
From Proto-Italic *sei (“so, thus”) used in parataxis, likely via the meaning "in this" as the locative singular of Proto-Indo-European *só (“this, that”); this older meaning is preserved in Latin sīc as well as in the oath sī dīs placet, cf. English so help me God. Related to Old English sē (“he, that”).