Form 8a. Conditionals Types 0,1,2

For practicing:
http://www.englishexercises.org/makeagame/viewgame.asp?id=8732;
https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit6/grammar/exercise2?cc=br&selLanguage=pt;
https://www.englisch-hilfen.de/en/exercises/if_clauses/mix.htm;
https://www.englisch-hilfen.de/en/exercises/if_clauses/mix2.htm;
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-108769.php;
http://www.englishexercises.org/makeagame/viewgame.asp?id=3575.