Question

A utilização do verbo to be na frase a seguir está correta? "That dog 'are' an old frien of mine."

( )Certo.

( )Errado.

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Answer 1

No, it's wrong (errado).

The form are corresponds to the third person plural of the verb to be, and the subject is in singular (that dog), thereby the verb shall be also in singular for the agreement. As a result, the clause should be written as:

That dog is an old friend of mine