Active passive

ACTIVE à PASSIVE

ACTIVE  sentences - the form is Present Perfect

          Watter surrounds in irland

PASSIVE  sentences – so it must to has been and  V3

          The irland surrounded by watter.

PASSIVE à ACTIVE

PASSIVE sentences – the form is Simple Present

          Ann’s purse stalen by a thief.

ACTIVE  sentences – so it must to change the verb from V3 to V1

          Thief has steal ann’s purse.