Thomas, together with his friends, is or are going to the theater?
Thomas is going to the theatre. Thomas is going to the theatre with his friends. Together with his friends, Thomas is going to the theatre.
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Thomas is going to the theatre.
Thomas is going to the theatre with his friends.
Together with his friends, Thomas is going to the theatre.
Thomas, together with his friends, is going to the theatre.
However: Thomas and his friends are going to the theatre. (The subject is now plural.)
Roger LooThomas, together with his friends, is or are going to the theater?
Parenthetical phrases set off by commas do not change the basic subject-verb agreement rules because such phrases are ignored for the purposes of agreement.
Thomas, together with his friends, is going to the theater.
Thomas, as well as his friends, is go