A conjunction is a word that connects parts of a sentence together. The words "and," "but" and "than" are among the more common conjunctions. Adverbs are words that modify verbs in a sentence. While conjunctive adverbs often sit in the middle of a sentence and connect phrases, they can occur at the start of a sentence.
"However" is one of the more common conjunctive adverbs used to start a sentence. In the statements "I do like ice cream. However, it isn't good for me," the conjunctive adverb "however" shows the relationship between the contrasting statements in the two sentences. Other common examples of conjunctive adverbs that can start a sentence include "accordingly," "finally," "meanwhile," "therefore" and "then." Typically, a conjunctive adverb is followed by a comma when used to start a sentence.
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