The Conjunctive Adverb
Recognize a conjunctive adverb when you see one.
When the job of an adverb is to connect ideas, we call it a conjunctive adverb. Here is the list:
A conjunctive adverb can join two main clauses. In this situation, the conjunctive adverb behaves like a coordinating conjunction, connecting two complete ideas. Notice, however, that you need a semicolon, not a comma, to connect the two clauses:
main clause + ; + conjunctive adverb + , + main clause.
Read these examples:
The dark skies and distant thunder dissuaded Clarice from her afternoon run; moreover, she had thirty calculus problems to solve for her morning class.
Leon's apartment complex does not allow dogs over thirty pounds; otherwise, he would have bought the gangly Great Dane puppy playing in the pet store window.
The cat ate a bowlful of tuna; then, to the squirrels' delight, the fat feline fell asleep in the rocking chair.
A conjunctive adverb will also introduce, interrupt, or conclude a single main clause. In this situation, you will often need commas to separate the conjunctive adverb from the rest of the sentence.
Check out these examples:
At 10 a.m., Paul was supposed to be taking his biology midterm. Instead, he was flirting with the pretty waitress at the coffee house.
Maria declined Jeff's third invitation to go out. This young man is determined, nevertheless, to take her to dinner one night soon.
After mowing the yard in the hot sun, Pedro was too hungry to shower. He did wash his dusty hands, however.
If the break is weak, do not use comma(s).
Anna called to say her car would not start. Rafael will therefore have to walk to school.
Weak interruption = no commas.
The long noodles splashed tomato sauce all over the front of Brenda's shirt. Ordering fettuccine was a mistake indeed.
Weak interruption = no comma.