it would surprise you
Te sorprendería el número de estudiantes que acabaron los deberes.
You’d be surprised by the number of students who finished their homework.
I thought you’d be surprised.
Te sorprendería lo que puedes aprender en una semana.
You’d be surprised what you can learn in a week.
Sabía que te sorprendería con esta noticia.
I knew this news would surprise you.
— Kal Ho Naa Ho (2003)
Te sorprendería el tiempo que espera la gente.
You'd be surprised how long people wait.