Punctuating Sentences
With five gallons of gas.
This is not a complete sentence.
Once you write a complete sentence, please repost and we'll help you with punctuation, if necessary.
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With five gallons of gas the car will run.
Now it's a complete sentence -- and you need a comma after "gas" -- OK?
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With five gallons of gas the car will go far.
http://grammar.ccc.commnet.edu/grammar/commas.htm
See #3 for this particular comma use.
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In order to punctuate sentences correctly, it is important to ensure that the sentence is complete. A complete sentence should have a subject and a verb and express a complete thought.
If the sentence is not complete, as in the first example "With five gallons of gas," it does not make sense on its own and is considered a sentence fragment. In this case, the sentence should be rewritten to include a subject and a verb.
The second example, "With five gallons of gas the car will run," is a complete sentence because it has a subject (the car) and a verb (will run) and expresses a complete thought. However, it requires punctuation to be properly punctuated. In this case, a comma is needed after "gas" to separate the introductory phrase from the rest of the sentence.
The third example, "With five gallons of gas the car will go far," is also a complete sentence. Since it has the same structure as the previous example, it also requires a comma after "gas" to separate the introductory phrase.
To learn more about the usage of commas in sentences, you can refer to resources such as the link provided, which explains different situations where commas are needed.