was about to
Nós tivemos de voltar logo porque a aula estava prestes a começar.
We had to go back quickly because class was about to start.
Nixon estava prestes a se tornar presidente.
Nixon was about to become president.
Eu estava prestes a sair, quando ele veio me ver.
I was about to leave when he came to see me.
O prédio em chamas estava prestes a cair.
The burning building was about to collapse.
Você sabe, isto estava prestes a acontecer cedo ou tarde.
You know, this was bound to happen sooner or later.
— Vítima do Passado (1996)
Tom estava prestes a beijar Mary quando o pai dela entrou no quarto.
Tom was about to kiss Mary when her father entered the room.
I was about to leave.
Mas tudo estava prestes a mudar.
But everything was about to change.
— Invasores - Nenhum Sistema Está à Salvo (2014)
Outra batalha dura estava prestes a começar.
Another tough battle was about to begin.
Quando ele estava prestes a sair, começou um terremoto.
Just as he was about to leave, an earthquake began.