Forms 5ac. Past Simple (had, was/were, could, regular verbs)

For practicing:
The forms of have (have, has, had)
https://agendaweb.org/exercises/verbs/have-has-had.htm;
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4262.php;
https://www.englisch-hilfen.de/en/exercises/tenses/have.htm;
Was/were
https://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03;
https://www.english-4u.de/en/tenses-exercises/was-were.htm;
https://www.englisch-hilfen.de/en/exercises/tenses/was_were.htm;
Could
https://agendaweb.org/exercises/verbs/modals/can-could-1;
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-91443.php;
https://www.perfect-english-grammar.com/modal-verbs-of-ability-exercise-1.html;
Regular verbs
https://agendaweb.org/exercises/verbs/past-simple/regular-forms;
https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_statements.htm;
https://www.grammarbank.com/simple-past-tense-regular-exercise.html;
https://www.english-4u.de/en/tenses-exercises/past-simple2.htm.

Forms 7a, 7b. Future forms. Conditionals Types 0,1,2

For practicing:
will/be going to
https://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future.htm;
https://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future2.htm;
https://www.englishpage.com/verbpage/verbs18.htm
Present Continuous
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-118827.php
Present Continuous/be going to
https://www.englishexercises.org/makeagame/viewgame.asp?id=4291
will/be going to/Present Continuous
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-6874.php
https://www.englisch-hilfen.de/en/exercises/tenses/future.htm
Conditionals Types 0,1,2
https://www.englishexercises.org/makeagame/viewgame.asp?id=5990;
https://www.ego4u.com/en/cram-up/tests/conditional-sentences-2;
https://www.englisch-hilfen.de/en/exercises/if_clauses/mix2.htm;
https://first-english.org/english_learning/if_clauses_conditional/61_if_clauses_tests_type_1_type_2.htm.

Forms 8a, 8c1, 8c2. Modals

For practicing:
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-87468.php;
http://www.focus.olsztyn.pl/en-modal-verbs-practice.html#.Xrkd0m5uLDd;
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-97711.php;
https://www.english-4u.de/en/grammar-exercises/modal-verbs.htm;
https://www.english-4u.de/en/grammar-exercises/modal-verbs2.htm;
https://www.english-4u.de/en/grammar-exercises/modal-verbs3.htm;
https://www.english-4u.de/en/grammar-exercises/modal-verbs4.htm;
https://www.english-4u.de/en/grammar-exercises/modal-verbs5.htm;
https://www.english-4u.de/en/grammar-exercises/modal-verbs6.htm.