Quiz/Test Prep:
http://www.studyblue.com
Grammar:
http://www.grammar-monster.com/
https://www.grammarly.com/handbook/
http://www.grammarbook.com/grammar/subjectVerb.asp
http://www.mhhe.com/socscience/english/langan/sentence_skills/exercises/ch04/p4exa.htm
http://grammar.about.com/od/tests/a/ExSubjectsVerbs.htm
Transitions:
https://owl.english.purdue.edu/owl/resource/574/02/
http://www.smart-words.org/linking-words/transition-words.html
http://www.studyblue.com
Grammar:
http://www.grammar-monster.com/
https://www.grammarly.com/handbook/
http://www.grammarbook.com/grammar/subjectVerb.asp
http://www.mhhe.com/socscience/english/langan/sentence_skills/exercises/ch04/p4exa.htm
http://grammar.about.com/od/tests/a/ExSubjectsVerbs.htm
Transitions:
https://owl.english.purdue.edu/owl/resource/574/02/
http://www.smart-words.org/linking-words/transition-words.html