Hola amigos en sexto. Ayer os enviamos unas cartas de Y6. Hello friends in 6th yesterday we sent some letters from Y6

Hola amigos en sexto. Ayer fuimos a correos y os enviamos 34 cartas de Y6.
 Hello friends in 6th yesterday we went to the post office and sent you 34 letters from Y6

The envelope is ready to go. 

We are holding your letters and our letters. Tenemos vuestras cartas y nuestras cartas.