B2.1 Questions

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

https://www.perfect-english-grammar.com/subject-questions-exercise-1.html Subject and Objects Questions

https://www.english-at-home.com/lessons/grammar-exercise-indirect-questions-at-work/ Indirect Questions

https://agendaweb.org/grammar/questions-interrogatives-words.html Indirect Questions