PRESENT SIMPLE / CONTINUOUS

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

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

3. http://www.engelsgemist.nl/present-simple-present-continuous/

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

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

6. https://www.englishpage.com/verbpage/verbs1.htm

PRESENT PERFECT SIMPLE / CONTINUOUS

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

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

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

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

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

6. https://www.test-english.com/grammar-points/b1/present-perfect-simple-present-perfect-continuous/

7. http://www.esl-lounge.com/student/grammar/3g9-present-perfect-simple-continuous.php

8. https://www.esl-lounge.com/student/grammar/3g41-present-perfect-simple-or-continuous.php

9. https://www.englishgrammar.org/present-perfect-or-present-perfect-continuous-tense-exercise/

10. https://www.e-grammar.org/present-perfect-simple-continuous/test1-exercise5/