present perfect - signal words

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

http://first-english.org/english_learning/english_tenses/present_perfect/57_present_perfect_word_order.htm

http://online-lernen.levrai.de/englisch/englisch_zeiten/present_perfect/70_present_perfect_mixed_exercise.htm

questions in the present perfect

http://www.englisch-hilfen.de/en/exercises/questions/present_perfect.htm
http://www.englisch-hilfen.de/en/exercises/questions/present_perfect2.htm

 http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?08

http://first-english.org/english_learning/english_tenses/present_perfect/30_present_perfect_questions.htm

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07

http://first-english.org/english_learning/english_tenses/present_perfect/31_present_perfect_questions_regular_verbs.htm

http://first-english.org/english_learning/english_tenses/present_perfect/35_present_perfect_fragen_irregular_verbs.htm

http://first-english.org/english_learning/english_tenses/present_perfect/40_present_perfect_questions_verbs.htm

http://first-english.org/english_learning/english_tenses/present_perfect/45_present_perfect_questions_word_order.htm

http://first-english.org/english_learning/english_tenses/present_perfect/46_present_perfect_questions.htm

class 6: present perfect in positive and negative sentences

http://www.englisch-hilfen.de/uebungen/zeiten/present_perfect_aussagen.htm
http://www.englisch-hilfen.de/uebungen/zeiten/present_perfect_mix.htm
http://www.ego4u.de/de/cram-up/tests/present-perfect-simple-1
http://www.ego4u.de/de/cram-up/grammar/present-perfect-simple/exercises
http://online-lernen.levrai.de/englisch/englisch_zeiten/present_perfect/02_present_perfect_uebungen.htm
http://online-lernen.levrai.de/englisch/englisch_zeiten/present_perfect/80_present_perfect_test.htm
http://www.perfect-english-grammar.com/present-perfect-exercise-1.html
http://www.perfect-english-grammar.com/present-perfect-exercise-2.html

questions in the simple past

Practice questions in the simple past! Write the correct questions and check yourself!

http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=1&type=question
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=2&type=question
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=3&type=question
http://www.ego4u.de/de/cram-up/grammar/exercises?tense=3&level=4&type=question
http://www.englisch-hilfen.de/en/exercises/questions/simple_past2.htm
http://www.englisch-hilfen.de/en/exercises/questions/simple_past.htm
http://www.adelescorner.org/grammar/past_tense/past_simple_quests2.html
http://www.perfect-english-grammar.com/past-simple-exercise-5.html