F8 Conditional

https://www.englisch-hilfen.de/en/exercises/if_clauses/type_1_statements.htm
https://www.englisch-hilfen.de/en/exercises/if_clauses/type_2_statements.htm
https://www.englisch-hilfen.de/en/exercises/if_clauses/type_3_statements.htm
https://www.ego4u.com/en/cram-up/tests/conditional-sentences-3