se puso a

started to

→ se
phrase Common #7,873
started to Used before an infinitive to say that someone began doing something.
SP: Se puso a estudiar después de cenar.
EN: He started to study after dinner.

Cuando Mary vio a Tom desnudo, se puso a reír.

When Mary saw Tom naked, she started laughing.

Nada más llegar a casa se puso a preparar la comida.

As soon as she got home, she started preparing the food.

Se puso a mear desde la galería sobre el sombrero de Biondi.

He started peeing from the gallery onto Biondi's hat.

— Amarcord (1973)

Ella se sentó y se puso a hacer nudos.

She sat down and started tying knots.

Eres tú quien se puso a jugar con las especias.

You're the one who started playing with the spices.

— Ratatouille (2007)

De repente, un perro se puso a ladrar.

Suddenly, a dog started barking.

Un extraño se puso a hablarme.

A stranger started talking to me.

Tom se puso a pintar.

Tom started painting.

Se puso a silbar una melodía.

He started whistling a tune.

Mi madre se puso a coser.

My mother started sewing.

Él perdió la compostura y se puso a arrojar cosas.

He lost his temper and started throwing things.

Tom sacó un lápiz y se puso a escribir.

Tom took out a pencil and started writing.

Sus manos temblaban ligeramente cuando se puso a hablar.

His hands trembled slightly when he began to speak.

Tom se puso a toser.

Tom started coughing.

El profesor se quedó dormido durante la clase y se puso a roncar fuerte.

The teacher fell asleep during class and started snoring loudly.

Tom se puso a cubierto.

Tom took cover.

El niño se puso a meter boche.

The boy started to make a fuss.

De pronto la novia se puso a reír a carcajadas.

Suddenly the bride burst out laughing.

Tom se puso a pelear con la gente que lo estaba observando.

Tom started fighting with the people who were watching him.