Hello, The second sentence is the correct one. The boys is the principle subject and has to take the plural verb are . In actual conversation, you probably would say The boys are going to town, and so is the girl.
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AnonymousDoes one say:An "as well as" phrase is ignored in determining agreement.
The boys as well as the girl is going to town.
or
The boys as well as the girl are going to town.
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