A comma (,) is a type of punctuation that signals the reader to pause. Commas are used for many different reasons in formal writing. The comma's main function is to set off text from the rest of the sentence (as in: After the event, we left for the weekend), or to give nonessential information (as in: Jimmy, my 8 year¬old cousin, loves dinosaurs.) Commas are also used for separating items in a series (as in: red, blue, and yellow) and before the main conjunctions (but, yet, for, ...)
Before the show, one of the large groups asked about the possibility of relocating their seats to the other side of the theatre. The manager simply had to say no, since he would have been inconveniencing so many people already in their seats.
The art teacher, who was out sick, left plans for the substitute to have the students create a sketch using pencil, charcoal, or pastels.
In the United States, inverted commas or single quotes are used to indicate that words within a quotation contain a statement or words from another source. Inverted commas or single quotes can also indicate that the words inside the inverted commas are ironic, sarcastic, or exaggerated. You can use the phrase in inverted commas to show what you are saying is not completely true.
My teacher always says, "If you can't understand the meaning of ‘to be or not to be', you have no business heading to university".