1) John, Mary, and Sam are best friends. 2) John, Mary, Sam are best friends. In sentence 1, the compound subject used the conjunction "and"(John, Mary, and Sam) and in sentence 2, without conjunction (John, Mary, Sam). Here my doubt is can we use the compound subject without conjunction or it must be necessary for compound subject?

  • In joint coordination (indeed any coordination) the coordinates are usually linked by the coordinator and. – BillJ Sep 4 '17 at 9:39
  • @BillJ Reference please. At least it can help me improve my answer. – user178049 Sep 4 '17 at 9:41
  • @user178049 The Cambridge Grammar (CGEL) -- (Huddleston & Pullum), and 'A Student's Introduction to English Grammar', also by H&P. – BillJ Sep 4 '17 at 9:47
  • @BillJ SIEG (p. 231) "... felt [tired, depressed, listless]" is possible. (Maybe I overlooked the word 'usually' in your comment.) – user178049 Sep 4 '17 at 10:23
  • @user178049 Yes, that's why I said "usually"! – BillJ Sep 4 '17 at 11:17

We distinguish two types of coordination: syndentic and asyndetic coordination.

Syndentic coordination is just a normal coordination with two elements being conjoined by one coordinator.

He and his sister are naughty.

That of asyndetic, however, is a rather different in that it takes no coordinator to indicate the coordination.

Quickly, resolutely, he strode into the bank

When three or more items are conjoined, the conventional style is to use one coordinator between the final conjoins.

John, Mary, and Sam are best friends.

Note that I said 'style' not 'rule'. Even if it were possible to use no conjunction here, I would avoid doing so.

Ref: http://www.ucl.ac.uk/internet-grammar/conjunct/asynd.htm

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