Commas After Introductory Words

Introductory words, like introductory phrases, require a comma. After introductory words, we use a comma to separate the introductory word from the independent clause. The introductory word in the sentence will frequently be an adverb. Consider the sample sentences below:

Meanwhile the cat stretched luxuriously in the sunshine.
Meanwhile, the cat stretched luxuriously in the sunshine.
Furthermore the educational institution will prosecute those individuals who plagiarize the institution’s written works.
Furthermore, the educational institution will prosecute those individuals who plagiarize the institution’s written works.
Suddenly an angry black cat sprang from the shadows.
Suddenly, an angry black cat sprang from the shadows.

This same rule applies to introductory clauses.

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