The previous topics have dealt with the revision of two present tenses already seen in the unit 1: the Simple Present and the Present Continuous, together with the two tenses of this unit 2, that is to say, the Simple Past and the Past Continuous. But the main grammar point in this topic is about prepositional phrases... DESCARGAR FUENTE: http://agrega.juntadeandalucia.es/visualizador-1/VisualizadorCS/VisualizarDatosNavSecuenciaNodo.do;jsessionid=700C5ECC24B6CC09A562216255FB0DB2?identificador=es-an_2010091113_9090959&idSeleccionado=ITEM-805ba545-521e-3a84-95ef-157bd40a15bc