Translation of "to write down" into Spanish

Requirement to write down or convert capital instruments

Obligación de amortizar o convertir los instrumentos de capital

I was unable to write down the number of the car.

No pude anotar la matrícula del auto.

In the morning I try to write down all the dreams I remember from the night before.

Por la mañana intento apuntar todos los sueños que recuerdo de la noche anterior.