unit_4_-_subject_or_object_questions.pptx

https://www.esl-lounge.com/student/grammar/3g26-subject-object-questions.php

Explanation + quiz: https://www.espressoenglish.net/subject-and-object-questions-in-english/

http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/subjobjquest1.htm

http://www.tinyteflteacher.co.uk/learn-english/grammar-practice/questions/subject-object-questions

unit_5_-_past_perfect.pptx

https://www.perfect-english-grammar.com/past-perfect-exercise-1.html

http://www.adelescorner.org/grammar/past_perfect/past_perfect.html

Past simple or past perfect? http://www.focus.olsztyn.pl/en-exercises-past-perfect-test-1.html#.XlQkbyhKjDd

Past simple or past perfect? https://www.english-grammar.at/online_exercises/tenses/t079-past-past-perfect.htm

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

unit_5_-_relative_pronouns.pptx

Who, which, whose: https://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm

Who, which, whose: https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?02

Who, whose: https://www.englisch-hilfen.de/en/exercises/pronouns/who_whose.htm

Fill in the gaps with a relative pronoun: https://www.esl-lounge.com/student/grammar/3g31-relative-clause-gap-fill-exercise.php

Sentence transformation: https://www.esl-lounge.com/student/grammar/3g64-relative-pronouns-sentence-transformations.php