1) "I talked to my teacher five hours ago."
"Hablé con mi maestro hace cinco horas."
2) "I have used the computer for seven hours."
"He utilizado el ordenador durante siete horas."
3) "I read a book two hours ago"
"Leí un libro hace dos horas"
4) "I have been studying Spanish for one year."
"He estado estudiando español durante un año."
5) "I watched Television yesterday."
"Vi Televisión ayer. "
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-I hope this helped :)
(If you need anymore help please feel free to ask)