Oraciones con by the time en past perfect?

I have worked for my uncle.

(Yo he trabajado para mi tío)She has finished her homework.

(Ella ha terminado su tarea)I have to go, we have talked for more than two hours.

(Yo me tengo que ir, nosotros hemos hablado por más de dos horas)We have visited them once a week for the last year.

(Nosotros los hemos visitado una vez por semana durante el último año)He has returned my carat last.

(El ha regresado mi automóvil al fin)It has rained once a week for the last month.

(Ha llovido una vez a la semana durante el último mes)They have completed the project.

(Ellos han completado el proyecto)I have cooked something special for you.

(Yo he cocinado algo especial para ti)I have worked in that firm for many years.

(Yo he trabajado en esa empresapor muchos años)We have loved each other for twenty years.

(Nosotros nos hemos amado uno al otro por veinte años)He has finished reading my book.

(Él ha terminado de leer mi libro)You haveinvested in something revolutionary.

(Tú has invertido en algo revolucionario)I have played this game several times.

(Yo he jugado este juego varias veces)We have looked everywhere for the keys.

(Nosotros hemos buscado en todas partes las llaves)I have watched two seasons of this T.

V. show.

(Yo he visto dos temporadas de este programa de televisión).