Grammar Activities

http://www.ego4u.com/en/cram-up/tests/conditional-sentences-1

http://www.ego4u.com/en/cram-up/tests/conditional-sentences-2

http://www.ompersonal.com.ar/omexercise/condicionales/unit18.htm

http://a4esl.org/q/h/vm/if-clauses.html

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/0cond1.htm