I can make the underlined phrase starting 'or' a nonessential element by setting it off with commas, can't I?
Yesterday Mr. Gray, the school principal, asked the teachers if they had invited the parents, or guardians, of unruly students to go to his office.
Rommel I can make the underlined phrase starting 'or' a nonessential element by setting it off with commas, can't I? No, you cannot. 'Guardians' in either case remain of equal significance with or without the commas—which are wrong, by the way.
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RommelI can make the underlined phrase starting 'or' a nonessential element by setting it off with commas, can't I?
No, you cannot. 'Guardians' in either case remain of equal significance with or without the commas—which are wrong, by the way.
You are confusing this situation with the use of commas to set off adjective clauses.