.
look at this video
https://learnenglishteens.britishcouncil.org/ar/grammar/intermediate-grammar/relative-clauses
https://agendaweb.org/grammar/relative-clauses-english-exercises.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=4219
https://www.examenglish.com/grammar/ND_relative_clauses.htm
https://elt.oup.com/student/solutions/int/grammar/grammar_03_012e?cc=ar&selLanguage=en
https://elt.oup.com/student/solutions/int/grammar/grammar_03_022e?cc=ar&selLanguage=en
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-72879.php
https://elt.oup.com/student/solutions/int/grammar/grammar_03_022e?cc=ar&selLanguage=en
https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?12