1. PASIVE VOICE
-Present Simple
am, is, are + Participio Pasado
La leche se vende aquí//Milk is sold here
-Present Continuous
am, is, are being + PP
El almuerzo se esta cocinando//Lunch is being cooned
-Past Simple
was, were + PP
El trabajo no se terminó//The work wasn't finished
-Past Continuous
was, were being + PP
El almuerzo se estaba cocinando//Lunch was being cooked
-Present Perfect
has, have been + PP
Las ventanas se han limpiado//The windows have been cleaned
-Past Perfect
had been + PP
La carta no se habia enviado//The letter hadn't been sent
-Going to
am, is, are going to be + PP
Las ventanas se van a limpiar//The windows are going to be cleaned
-Must
must be + PP
La carta se debe enviar//The letter must be sent
-Future
will be + PP
Las cartas se enviaran//The letters will be sent
-Can
Can be + PP
Eso se puede hacer mañana//That can be done tomorrow
-Have to
has, have to be + PP
Eso se tiene que hacer//That has to be done