Would the sentence, "A car drove by, just like any other day," would a comma go before "just"? If so, why? Is it non-restrictive? Is there a good way to know if something is non-restrictive rather than restrictive?
A non-restrictive clause will not change the meaning of a sentence if it is omitted, and should be preceded by a comma. In your example, "just like any other day" is non-restrictive since it is not providing any essential information, so the comma is necessary.
I agree with the above posts- It's an adverb clause. But, to answer your question, I wouldn't put a comma there. We put commas if the sentence begins with an adverb clause but not if it's at the end. Check out this example:
While I was drinking beer (adverb clause- telling is when something happens modifying the verb answer), I answered the phone (main clause). We use a comma here.
I answered the phone while I was drinking beer. (no comma- the adverb clause comes at the end).
Hope that helps! -Tom