Revising Present Perfect and Past Simple

Spanish speakers have a lot of problems to distinguish between these two tenses because both are pretérito (past) in Spanish. Let's revise them:

• PRESENT PERFECT (up to now)
• we use it with typical questions such as Have you ever been to...?
• with ever / never
• with expressions such as once / twice / many times
• with already (+) and yet (- and ?)
• with for and since

• PAST SIMPLE (past reference of time)
• last _______
• __________ ago
• when I was young...
• in ______ (year)

Here you have some exercises to practise:

• http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex03
• http://www.englishpage.com/verbpage/verbs5.htm
• http://www.curso-ingles.com/ejercicios-test-ingles/present-perfect-past-simple.php
• http://www.englishexercises.org/makeagame/viewgame.asp?id=1496
• http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/ppvpast1.htm