Khan Academy
Khan Academy: Coordinating and Subordinating Conjunctions
Identify and use coordinating and subordinating conjunctions in sentences.
TES Global
Blendspace: Prepositions and Subordinating Conjunctions
A nine-part learning module with links to texts and videos about propositions and subordinating conjunctions.
Grammarly
Grammarly Blog: Conjunctions
This page focuses on conjunctions including what conjunctions are; the types of conjunctions: Coordinating, Correlative, and Subordinating; how to start sentences with conjunctions, examples of each of the above, and lists for each type...
Robin L. Simmons
Grammar Bytes: Coordinating Conjunctions
This site provides a very thorough explanation of coordinating conjunctions, complete with a section distinguishing coordinating from subordinating conjunctions, a section on proper punctuation of conjunctions, and a study aid to help in...
The Tongue Untied
The Tongue Untied: Conjunctions
Maintained by the University of Oregon School of Journalism and Communications, this site offers a good definition and numerous examples of coordinating conjunctions. Also has hyperlinks to sections on subordinating conjunctions,...
English Club
English Club: Learn English: Grammar: Conjunctions: Introduction to Conjunctions
An explanation of coordinating and subordinating conjunctions with examples and example sentence.
Other
Tidewater Community College: Writing Center: Coordinating Conjunctions
This site offers a good explanation of coordinating, subordinating, and correlative conjunctions. Provides several charts identifying various conjunctions and their meanings.
University of Sydney (Australia)
The Write Site: Common Mistakes
This interactive exercise provides eight questions for students. Students will identify verb errors and sentence fragments.