Why do we say "fui" for both "I went" and "I was" in Spanish?
[Bajar para español] To pave the way for a comparison between the shared simple past tense of “ir” and “ser”, let’s begin with the complex history of “ser”. Its origins combine Proto-Indo-European *h₁ésti (to be) and *bʰuH- (to become or to grow) via Latin “esse.” Its simple past forms, “fui, fuiste, fue,” link to the *bʰuH- root, which also appears in English "be" and German "bist." Other forms like “es,” “eres”, and “soy” via archaic Latin esum from esse link to *h₁ésti. This phenomenon of filling in gaps in verb conjugations or alternating roots, is called suppletion. Another instance occurred with the Latin verb sedere (to sit) > se(d)ere > Old Spanish seer> “ser” replacing the Latin infinitive “esse”. Examining "ir," the Spanish verb "to go," reveals another case of suppletion. The Latin verb “ire” complemented its conjugations in early Romance or Old Spanish and Galician-Portuguese with other verb forms. In the present tense, speak