there is /there are

https://www.englisch-hilfen.de/en/exercises/various/there_is_there_are.htm

https://agendaweb.org/grammar/there_is_are-exercises.html

https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/There_is_-_there_are/There_is_-_there_are_na601gy

https://elt.oup.com/student/solutions/elementary/grammar/grammar_03_012e?cc=global&selLanguage=en

http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/there-there-are-it