Explicação com vídeo: https://www.youtube.com/watch?v=fvHqtdhtPhU&t=65s
Link 1: https://www.grammarbank.com/zero-conditional-exercise.html
Link 2: https://www.e-grammar.org/conditional-0-exercises-pdf/
Link 3: https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit6/grammar/exercise2?cc=us&selLanguage=en
Link 4: https://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/0cond1.htm
