Para identificar:
Past Continuos solo necesitas el "verbo en pasado" o el auxiliar "did" en afirmativo o en negativo
ejemplos:
"verbo en pasado"- She wrote that letter
"Usando el Auxiliar DID"
En negativo - She did not write that letter
En Pregunta - Did she write that letter?
Para identificar:
Past Continuos, necesitas ver que usas el ING al final de los verbos
Ejemplo:
En forma de afirmacion:
She was not writing that letter
en forma de pregunta:
Was she writing that letter?
Para identificar Past Perfect
busca el HAVE + VERBO en PARTICIPIO PASADO
ejemplo
She had written that letter
o en pregunta
Had she written that letter?
Suerte
Profesoy