I have learned that adverbs should be at the end of a sentence.

What is the subject of this sentence? Is it Using a comma after and in a list?

Is there any adverb modifying the noun or of which members is this sentence composed?

Which of these sentences is correct?

Using a comma after "and" in a list is optional.


Using a comma after "and" is optional in a list.

  • I'd say moving in a list to the end could better carry the implication ...but it's mandatory in other contexts, but it's a fine point. Both sequences are fine (and both are potentially ambiguous as regards implied scope). – FumbleFingers Reinstate Monica Sep 20 '17 at 18:45

Both are fine. A gerund phrase acts like a typical noun, and here the entire phrase "Using a comma after 'and'" is the subject of either sentence. "In a list" is an adverbial phrase that describes where the subject is "optional".

Other examples:

Climbing the Alps is recommended when visiting Switzerland.

Dancing the merengue is generally easiest for beginners.

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