will believe
Solo si nos ve así, creerá lo del compromiso.
Only if he sees us like this will he believe we're engaged.
— La doncella (2016)
No creerá ni una sola palabra.
He won't believe a single word.
— Corre Lola, corre (Run Lola Run) (1998)
You'll believe me when you see this.
— El mundo secreto de Arrietty (2010)