CONDITIONAL SENTENCES

On the following page you have A LOT OF exercises, like that, you can choose which type you prefer: multiple choice, fill-in exercises, only affirmative sentences, mixed, and so on.


http://www.englisch-hilfen.de/en/exercises_list/if.htm

On the next one you have all the conditionals in one exercise.

http://speakspeak.com/english-grammar-exercises/upper-intermediate/zero-first-second-third-conditionals