perlovka_blog (perlovka_blog) wrote,
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Из сегодняшнего ликбеза

Почему Joe в запятых, а Robert нет?
  • John Kennedy’s older brother, Joe, loved to fly.
  • John Kennedy’s younger brother Robert loved to play football.

President John F. Kennedy had three brothers. Joe was older than John, and Robert and Ted were younger. Given that information, notice the presence and absence of commas in the two sentences below:
  • John Kennedy’s older brother, Joe, loved to fly.
  • John Kennedy’s younger brother Robert loved to play football.
Because John had only one older brother, the name “Joe” is merely supplemental information; the meaning of the sentence would be unchanged with or without the actual name. Joe is not essential information.
In the second sentence, however, “Robert” must not be set off with commas because John Kennedy had more than one younger brother. “Robert,” in that case, is essential information.
Use commas around information that is not essential or could be considered parenthetical. Do not use commas if that information is necessary for the correct interpretation of the sentence.

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