Do you need to put a comma after the word, "suddenly?" I have the word at the very beginning of a sentence.

No.

Thank you! I am proofreading the final copy of my English composition before I turn it in. You've been a big help!

You're welcome.

When it comes to using a comma after the word "suddenly" at the beginning of a sentence, it depends on the context and the specific sentence structure. In general, when "suddenly" is used to introduce a complete sentence or an adverbial clause with a strong contrast or surprise, a comma is often used after it. However, if "suddenly" is used to modify the verb in the sentence, a comma is usually not necessary. Here are examples for better understanding:

1. "Suddenly, the phone rang." - Here, a comma is used after "suddenly" because it introduces a complete sentence.

2. "Suddenly, without warning, the car swerved." - The use of commas after "suddenly" and "warning" emphasizes a strong contrast, so both commas are appropriate here.

3. "He suddenly realized his mistake." - In this case, "suddenly" modifies the verb "realized," and it functions as an adverb. Therefore, a comma is not necessary in this sentence.

Remember that punctuation rules can sometimes vary based on style guides or personal preferences. It's always a good idea to consult a reputable grammar resource or style guide for specific guidelines on this topic.