Use comma to set off introductory element

Whenever your sentence begins with an introductory element, set it off with a comma. Think of the the comma as a handshake.

An introductory element is a word, phrase or clause that provides important information at the beginning of the sentence before the main subject and verb appear. Consider this sentence:

After the dance, they kissed under the moonlight.

In the above example, after the dance is the introductory element with they the main subject and kissed the verb. The introductory isn’t needed to make a complete sentence as they kissed under the moonlight could stand on it own. Still, the introductory element serves a somewhat important purpose in the sentence because it tells when (after the dance) the main action (they kissed) occurred. As it’s extraneous, however, it is set off by a comma.


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