High-frequency irregulars: fui, tive, fiz, vi, disse

• ser/ir → fui, foi, fomos, foram (same forms!)

• ter → tive, teve, tivemos, tiveram

• fazer → fiz, fez, fizemos, fizeram

• ver → vi, viu, vimos, viram

• dizer → disse, disse, dissemos, disseram

• Other essentials: vim (vir), estive (estar), pude (poder), quis (querer)

• These verbs show up in nearly every past-tense conversation

• Mostly memorization — but the -ive family (tive/estive) shares a pattern

You literally can't talk about the past without these — try describing yesterday without fui (I went), tive (I had), or fiz (I did). Good luck! These irregulars are the backbone of every story: Fui ao cinema (I went to the movies), Tive um problema (I had a problem), Vi sua mensagem (I saw your message). Nail them and you'll follow most everyday past-tense talk — and finally answer "O que você fez no fim de semana?" like a local instead of freezing up.

The Big Five Irregulars

SER/IR (to be / to go) — Identical forms!

Context determines the meaning:

Daily Activities (Past)

• "Fui ao supermercado ontem" (I went to the supermarket yesterday)

• "Tive uma reunião importante" (I had an important meeting)

• "Fiz todo o trabalho sozinho" (I did all the work alone)

• "Vi a Maria no shopping" (I saw Maria at the mall)

• "Ele disse que volta amanhã" (He said he's coming back tomorrow)

Weekend Narratives

• "Foi um fim de semana ótimo" (It was a great weekend)

• "Tivemos um churrasco em casa" (We had a barbecue at home)

• "Fizeram uma festa surpresa" (They threw a surprise party)

• "Vimos o jogo juntos" (We watched the game together)

SER / IR: only context tells them apart

Because the forms are identical, some sentences are genuinely two-way:

• "Como foi?" = How was it? OR How did it go?

• "Foi bem" = It was good OR It went well

• "Foi ontem" = It was yesterday OR He/She went yesterday

PÔDE vs. PODE

A single accent marks the tense:

• Pôde (could — past) with the circumflex

• Pode (can — present) without it

It's one of the few accent distinctions the spelling reform kept.

Ever wonder why ser and ir share the exact same past tense (fui, foi, fomos, foram)? It's a two-thousand-year-old borrow: the verb ir (to go) never had its own past, so it took the forms of the Latin verb esse ("to be"), whose perfect was fui. That's why, to this day, fui can mean both "I was" and "I went" — only context tells you which.

Sources: Fui (do verbo ser) e fui (do verbo ir) — Ciberdúvidas