asix 19/05/2011 to or ing

http://worldofenglish.com/exe.php?Constructs/gerunds.tra
http://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?21

 http://www.ego4u.com/en/cram-up/tests/infinitive-gerund-2


http://www.englishgrammarsecrets.com/ingform/exercise5.swf
 
http://www.englishgrammarsecrets.com/ingform/exercise2.swf
 
http://www.carmenlu.com/first/grammar/verbs_ing1b.htm

http://www.esl-lounge.com/student/grammar/3g12-work-to-work.php 

http://www.curso-ingles.com/ejercicios-test-ingles/test_gerundio.php

http://www.englishgrammarsecrets.com/ingform/exercise3.swf