GRAMMAR

http://utminers.utep.edu/micontreras/Verb%20Tense%20Quiz%201.htm

http://esl.fis.edu/grammar/q7m/1.htm

http://a4esl.org/q/h/mc006-ck.html

https://www.examenglish.com/grammar/future_perfect.htm

https://www.englishclub.com/grammar/quizzes.htm

https://elt.oup.com/student/practicegrammar/int/a_testzone/?cc=co&selLanguage=en

https://www.perfect-english-grammar.com/grammar-exercises.html

https://www.ego4u.com/en/cram-up/grammar

https://agendaweb.org/grammar-exercises

https://www.english-grammar.at/online_exercises/quantifiers/qf013.htm