CONDITIONAL RESOURCES

http://www.eslflow.com/conditionalsrealunrealsituations.html

FIRST CONDITIONAL

EJERCICIOS DE LA PRIMERA CONDICIONAL
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond2.htm

http://www.perfect-english-grammar.com/first-conditional-exercise-1.html

http://www.englisch-hilfen.de/en/exercises/if_clauses/type_1_statements.htm