Search for a Grammar Activity http://www.spunkyenglish.com/Century/index.php
Different kinds of activities -listed by level http://abeonline.mpls.k12.mn.us/
Many Grammar Activities http://www.eflnet.com/grammar/index.php
prepositions #1 http://www.english-zone.com/grammar/at-in1.html
prepositions #2 http://www.usingenglish.com/quizzes/318.html
prepositions #3 http://www.eclecticenglish.com/gapfillers/Prepositions.html
What is the plural? http://www.manythings.org/fq/1/8990.html
Prepositions Handout http://www.asu.edu/duas/wcenter/prepositions.html
MANY exercises to practice past tense (irregular and past vs. past perfect) http://www.collegeem.qc.ca/cemdept/anglais/pasttenl.htm
Exercises for all grammar topics http://www.collegeem.qc.ca/cemdept/anglais/
Grammar Quiz: What do you need to study? http://www.collegeem.qc.ca/cemdept/anglais/trouble3.htm