Encara no tenim significats per a "use a comma".
1When the letter is informal use a comma.
2Don't worry, though, you can continue to use a comma to delimit the primary and secondary keys.
3If the clause is not essential to the meaning of the sentence, use a comma and the word which to attach it.
4Unconventional punctuation-forexample using a comma to splice two sentences-hasalso been retained exactly as printed.
5A French printer named Morel used a comma in the outer margin to indicate a quoted line about 1550.
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