Double Object Pronoun

http://www.studyspanish.com/practice/iodopro.htm

http://www.quia.com/jg/89820.html

http://www.quia.com/pop/10718.html

http://www.colby.edu/~bknelson/SLC/DO_IO_3.php

http://www.colby.edu/~bknelson/SLC/DO_IO_2.php

http://www.colby.edu/~bknelson/SLC/DO_IO_1.php