Conjuction

Conjunction: A word that joins other words or parts of a sentence together.

Coordinating conjunctions connect grammatically equal elements. These conjunctions are used when writing compound sentences and include:

and

but

or

nor

for

so

yet

Correlative conjunctions are pairs of conjunctions that connect grammatically equal elements. These conjunctions include:

either/or

neither/nor

not only/but also

whether/or

both/and

Subordinating conjunctions introduce a subordinate clause. This means that a clause that begins with a subordinating conjunction cannot stand alone as an independent thought.
 

• Incorrect Example: Mary walked out of the film when she spilled the soda. Although she liked the movie.
• Correct Example: Although she liked the movie, Mary walked out of the theatre when she spilled the soda.
   
• Incorrect Example: Since I wanted to save money. I made the decision to attend a community college.
• Correct Example: Since I wanted to save money, I made the decision to attend a community college.
   

Common Subordinating Conjunctions
after although as as if, because before	even though if in order that in order to rather than	since so that than that though	unless until when where whether while

Conjunctive adverbs are adverbs used to indicate the relationship between independent clauses. The key word here is independent, which means you need to use a semi-colon if you want to use the clauses in the same sentence. If not, then you must write two separate sentences. Used incorrectly, conjunctive adverbs can lead to sentences with comma splices.
 

Conjunctive Adverbs
accordingly also anyway besides certainly consequently conversely	finally furthermore hence however incidentally indeed instead	likewise meanwhile moreover nevertheless next nonetheless otherwise	similarly specifically still subsequently then therefore thus

• Incorrect Example: I decided to teach a course on the Titanic, therefore, I read many books about the ship this summer. (This is a comma splice, because you are using a comma to connect two independent thoughts.)
• Correct Example: I decided to teach a course on the Titanic; therefore, I read many books about the ship this summer. (Semi-colons are used to connect two independent thoughts. See the Style Guide.)
• Correct Example: I decided to teach a course on the Titanic. Therefore, I read many books about the ship this summer.