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Passive Voice, PRESENT SIMPLE : The fotos are taken, PRESENT CONTINUS.:…

- - - - c) Some communities have been able to control their growth.
        
        d) Several social groups could be connected by the Internet.
        
        e) Young students are never tired of chatting with friends on email.
        
        Dois elementos são indispensáveis para a formação da voz passiva: verbo To Be e o verbo principal no “Past Participle” antecedidos pelo modal “could”. :check:
        
        na alternativa c), o verbo “to be” está no Present Perfect.