PAST AND PRESENT TENSES

http://www.englishpage.com/verbpage/verbs16.htm

http://www.englishpage.com/verbpage/verbs17.htm

http://www.english-4u.de/tenses_ex1.htm

http://www.english-4u.de/tenses_ex2.htm

http://www.english-4u.de/tenses_ex3.htm

http://www.english-4u.de/tenses_ex9.htm

http://www.english-4u.de/tenses_ex10.htm

PAST SIMPLE VS PAST PERFECT SIMPLE

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex04

https://www.ego4u.com/en/read-on/countries/usa/tour/orlando

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises?ex08

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

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/tests?test2

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

http://www.english-4u.de/past_perfect_ex5.htm

http://www.englishtenses.com/test/past_perfect_or_past_simple

http://first-english.org/english_learning/english_tenses/comparison_tenses/40_simple_past_or_past_perfect_exercises.htm

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

https://english.lingolia.com/en/grammar/tenses-comparison/simple-past-past-perfect/exercises

PRESENT PERFECT SIMPLE VS PRESENT PERFECT CONTINUOUS

http://www.englishpage.com/verbpage/verbs7.htm

http://www.englishpage.com/verbpage/verbs8.htm

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-1.html

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-2.html

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-3.html

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex05

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex08

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex09

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex10

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex11

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test1

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test2

http://esl.fis.edu/grammar/multi/ppsppc.htm

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-30523.php

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

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive3.htm

http://www.autoenglish.org/gr.percon.i.htm

PAST SIMPLE VS PRESENT PERFECT SIMPLE

http://www.englishpage.com/verbpage/verbs5.htm

http://www.englishpage.com/verbpage/verbs6.htm

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex05

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex08

https://www.ego4u.com/en/read-on/countries/usa/tour/grand-canyon#exercises

https://www.ego4u.com/en/read-on/countries/uk/tour/edinburgh#exercises

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test1

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test2

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test3

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

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect3.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect4.htm

http://www.perfect-english-grammar.com/past-simple-present-perfect-1.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-2.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-3.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-4.html

http://www.curso-ingles.com/practicar/ejercicios/present-perfect-vs-past-simple

http://www.usingenglish.com/quizzes/228.html

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/ppvpast1.htm

http://www.agendaweb.org/verbs/present-perfect-simple-past-simple-exercises.html

PAST SIMPLE VS PAST CONTINUOUS

http://www.englishpage.com/verbpage/verbs4.htm

http://www.englishpage.com/verbpage/verbs3.htm

http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html

http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-2.html

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex05

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex08

https://elt.oup.com/student/project3rdedition/level5/unit1/grammar/exercise1?cc=us&selLanguage=en

http://www.englishexercises.org/makeagame/viewgame.asp?id=734

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

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive2.htm

http://baladre.info/english/sedaviwebfront/pastsimplecontinuous.htm

http://www.agendaweb.org/verbs/past-continuous-past-simple-exercises.html

PRESENT SIMPLE VS PRESENT CONTINUOUS

http://www.englishpage.com/verbpage/verbs1.htm

http://www.englishpage.com/verbpage/verbs2.htm

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex05

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex08

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex09

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex10

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex11

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex12

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test1

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test2

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3

http://www.perfect-english-grammar.com/present-simple-present-continuous-1.html

http://www.perfect-english-grammar.com/present-simple-present-continuous-2.html

http://www.perfect-english-grammar.com/present-simple-present-continuous-3.html

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm

https://elt.oup.com/student/solutions/preint/grammar/grammar_01_012e?cc=global&selLanguage=en

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=1438

http://www.agendaweb.org/verbs/present-continuous-tense.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=2946

http://www.carmenlu.com/first/grammar/presentcont11.htm

http://english-exercise.net/grammar/verb-conjugation/present-simple-and-continuous-2/