ENGLISH II UNIT 8 (UNIT 6) GRAMMAR 8-1

there is/ there are  (presente)

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

there was and there were (pasado)

https://www.superprof.es/apuntes/idiomas/ingles/gramatica-inglesa/verbs/exercises-there-was-were-simple-past-i.html