Este es el esquema que he utilizado en clase para explicaros los cambios en tiempos verbales que hay que realizar al pasar de voz activa a pasiva. Tiempo verbal de la frase activa Frase activa Frase pasiva present I write a letter The letter is written present continuos I'm writing a letter The letter is being written past I wrote a letter The letter was written past continuos I was writing a letter The letter was being written present perfect I've written a letter The letter has been written past perfect I had written a letter The letter had been written future I will write a letter The letter will be written future II I'm going to write a letter The letter is going to be written modals I have to write a letter The letter has to be written modals I should write a letter The letter should be written modals I must write a letter The letter must be written http://www.curso-ingles.com/gramatica-inglesa/pasiva.php También expliqué que si incluimos el complemento agente en la frase en voz pasiva, usando un pronombre, éste tendrá función de objeto, y no de sujeto. Ej.: I, you, he, she, it, we, you, they Me, you him, her, it, us, you, them Recordad, siempre nos aparecerá en la voz pasiva un elemento más en el verbo. Introduzco y conjugo el verbo “to be” según el tiempo verbal en que desearía expresar la voz activa, y le añado el participio (palabra de color verde - en verbos irregulares, 3ª columna. Si es un verbo regular, se añade –ED). I will write the letter Someone washes the car every two weeks The letter will be written by me The car is washed every two weeks