1

why do we use an active form of present perfect in the following sentence but we do not use a passive of it i.e, has been evolved?

The island of Mauritius has evolved from an agricultural to a semi-industrialized country over the past three decades.

2

Because to evolve is an intransitive verb, it does not take an object.

You cannot evolve something, something is not evolved by something else.

That also means that a passive form (implying that the evolving is done by something to Mauritius) is not an option.

  • 1
    +.75 Evolve may be used transitively: one may evolve plans, or solutions, or ideas, and that use will accommodate a passive as well. But this use demands an 'agent', a person or institution actively pursuing an end, which is contrary to the general notion of biological or social evolution. – StoneyB Feb 4 '14 at 22:04

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