1A QUESTION FORMATION

You can have further practice about  this grammar point in the links below:

http://www.englisch-hilfen.de/en/exercises/questions/form3.htm

http://www.englisch-hilfen.de/en/exercises/questions/form2.htm

http://www.bbc.co.uk/apps/ifl/worldservice/quiznet/quizengine?ContentType=text/html;quiz=125_questions_prepos

https://elt.oup.com/student/englishfile/upperint/a_grammar/file01/nef_upperint_grammar01_a01?cc=global&selLanguage=en

http://www.usingenglish.com/quizzes/312.html

http://a4esl.org/q/f/z/zz13mlc.htm

http://www.adelescorner.org/grammar/qtags/qtags_mixed_tenses.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=719