Al irse a dormir

Question

Alfredo esperó la noche, y al irse a dormir puso debajo de la almohada un diente.

I understand the meaning... But can you explain me this "al" ?

Thanks.

Answer 1

Before a verb 'al' can be equivalent to the English 'upon' or 'when'.

I did not know it, thank you! - Uciki, Nov 10, 2012

:-) - francobollo, Nov 10, 2012