Esperanto grammar
Personal pronouns are: mi - I, ci - thou singular, li - he, ŝi - she, ĝi - it, ni - we, vi - you singular or plural, ili - they, oni - one/they, si (self). The pronoun oni is used for uncertain subject (like man in German). The pronoun ci means thou but people do not use it much. Instead they use vi, almost exclusively, as the singular form of you, or the plural form - you all.