Grammar help:
Online quizzes
I have not taken all of these quizzes, so some may be of limited use. However, I have browsed, and many of these sites should work well to help you.
Locating subject/verb/objects
http://yourpage.blazenet.net/bterney/DOIO.htm
http://www.le.ac.uk/ee/jmc21/legp/dobj1.html
http://grammar.uoregon.edu/nouns/nounquiz1/Iquizn.html
http://grammar.uoregon.edu/verbals/verbalquiz1/Iquizvbl.html
http://grammar.uoregon.edu/verbals/verbalquiz2/Iquizvbl2.html
http://www.quia.com/quiz/242901.html
http://www.kwiznet.com/p/takeQuiz.php?ChapterID=2292&CurriculumID=16
http://www.syvum.com/cgi/online/serve.cgi/members/gidi2/quizzes/Subject.tdf
http://www.dailygrammar.com/106to110.shtml
phrases
http://www.quia.com/quiz/298373.html
http://geocities.com/mrsdgrelle/Grammar.html
http://www.ucalgary.ca/UofC/eduweb/grammar/course/sentence/2_4c.htm
http://www.ucalgary.ca/UofC/eduweb/grammar/course/sentence/2_4d.htm
http://yourpage.blazenet.net/bterney/verbals.htm
http://grammar.uoregon.edu/verbals/verbalquiz1/Iquizvbl.html
http://www.gsgis.k12.va.us/facultyweb/hwaller/webpages/grammar/phrases-review.htm
http://www.classzone.com/books/lnetwork_gr07/page_build.cfm?id=quiz&ch=7
http://grammar.uoregon.edu/phrases/phrasequiz2/Iquizphrase2.html
http://owl.english.purdue.edu/handouts/grammar/g_verbals.html
http://www.dailygrammar.com/211to215.shtml
http://yourpage.blazenet.net/bterney/verbals.htm
http://a4esl.org/q/h/9901/cw-verbphrases.html
http://www.dailygrammar.com/206to210.shtml
http://www.engl.niu.edu/dhardy/grammarbook/program3/phrase_slide21.html
clauses