https://www.englisch-hilfen.de/en/exercises/if_clauses/type_2_mix3.htm
https://www.englisch-hilfen.de/en/exercises/if_clauses/type_2_mix4.htm
https://www.engblocks.com/grammar/exercises/conditionals/conditional-sentences-type-2-positive-exercise-1/
https://www.engblocks.com/grammar/exercises/conditionals/conditional-sentences-type-2-positive-exercise-2/
