Forms 8a, 8b. Present Perfect. Present Perfect Continuous. Present Perfect vs Past Simple. Such vs So

 For practicing:

PRESENT PERFECT vs PRESENT PERFECT CONTINUOUS

https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements2.htm;

https://www.ego4u.com/en/cram-up/grammar/present-perfect-progressive/exercises;

https://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-1.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?ex10;

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

PRESENT PERFECT vs PAST SIMPLE

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

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

https://www.english-4u.de/en/tenses-exercises/perfect-past-simple.htm;

SUCH vs SO

https://www.perfect-english-grammar.com/so-and-such-exercise-1.html;

https://www.grammarbank.com/so-such-such-a.html.

Forms 6a, 6c. Modals. Countable and uncountable nouns. Present Perfect

 For practicing:

MODALS

https://www.englishexercises.org/makeagame/viewgame.asp?id=3023;

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-87468.php;

COUNTABLE AND UNCOUNTABLE NOUNS

https://www.englisch-hilfen.de/en/exercises/confusing_words/much_many5.htm;

https://www.englisch-hilfen.de/en/exercises/confusing_words/some_any3.htm;

https://www.englisch-hilfen.de/en/exercises/confusing_words/some_any.htm;

https://www.englishexercises.org/makeagame/viewgame.asp?id=7502;

https://www.englishexercises.org/makeagame/viewgame.asp?id=6098;

PRESENT PERFECT

https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises;

https://www.perfect-english-grammar.com/present-perfect-exercise-4.html;

https://www.really-learn-english.com/present-perfect-exercises.html#01;

https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements2.htm.