<p>in the princeton review there were two questions concerning commas:</p>
<p>it was like ella fitgerald, the jazz singer, bla bla bla </p>
<p>i put no error, it said though to remove the commas, why? </p>
<p>same thing with this:</p>
<p>the black, some adjective female</p>
<p>it said no comma, why?</p>
<p>the first one..i need more info. the second one: it's ADJ + ADJ + NOUN. you would put commas inbetween the adjectives. so another one might be: black, tall, and strong female.........</p>
<p>For the first one you need commas because you are giving details on that certain person. For example:</p>
<p>John Doe, a famous singer, once said blah blah blah...</p>
<p>You can rephrase the sentence so you don't need commas, but you can't just remove the commas. You need that pause there to show that you are giving details about that person. I can't really explain it much more since I just learned it like that but I hope that helps.</p>
<p>for the first sentence, you use commas only when it is nonessential information. if it is descriptive information essential to the sentence making sense, you don't use commas.</p>
<p>for the second example, when you have a bunch of adjectives that could be arranged any way at all (interchanged with eachother), you use commas between. I believe they are called coordinating adjectives. when the order of the adjectives actually matters (it sounds really awkward to have one in front of the other), you don't use commas. I have no idea what those are called:(</p>
<p>i hope that makes sense?</p>
<p>Can you please provide the entire sentence for each of them? It would be much easier to answer you questions.</p>