4th ESO- past simple , past perfect, present perfect

1. http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm

2. http://www.ego4u.com/en/cram-up/grammar/simpas-pasper/tests?test1

3. http://www.englishpage.com/verbpage/verbs11.htm

4. Present perfect or past simple (easy)