answered, responded
Desculpe-me por não ter respondido antes.
I apologize for not replying sooner.
My mistake was replying.
Tom poderia ter respondido todas aquelas questões.
Tom could have answered all those questions.
Você deveria ter respondido a carta dele.
You should have replied to his letter.
Americanos teriam respondido diferente dos japoneses.
Americans would have responded differently than the Japanese.
Pensei que Tom tivesse respondido todas as suas perguntas.
I thought Tom had answered all your questions.
Por favor me perdoe por não ter respondido à sua carta.
Please forgive me for not replying to your letter.
Tom poderia ter respondido todas aquelas perguntas.
Tom could have answered all those questions.