Put the verbs in brackets into the correct passive form. 1) Global warming ___is believed__ (to believe) to be caused

Пассивный залогPassive voice

 

  Пассивный залог употребляется, когда действие совершает не подлежащее, а само действие совершается над ним. Существует три вида пассивного залога по времени:

• Present
• Past
• Future

  и по типу действия:

• Simple
• Continious
• Perfect

 Пример использования 

  1) Global warming is believed to be caused by the greenhouse effect. 2) The seas are filled with poison: industrial and nuclear waste, chemical fertilisers and pesticides. 3) If nothing is done about it, one day no animal or plant will be able to live in the seas. 4) Tons of harmful substances are emitted daily by industrial enterprises. 5) As globalization continues and the earth\'s natural processes transform local problems into international issues, few societies are left untouched by major environmental problems. 6) Acid rain, one of the most important environmental problems of all, cannot be seen. The invisible gases that cause acid rain usually come from automobiles or coal-burning power plants. 7) Air pollution can have serious consequences for the health of human beings; the natural ecosystem is affected severely by it. 

1) Global warming is believed to be caused by the greenhouse effect.2) The seas are filled with poison: industrial and nuclear waste, chemical fertilisers and pesticides.3) If nothing is done about it, one day no animal or plant will be able to live in the seas.4) Tons of harmful substances are emited daily by industrial enterprises.5) As globalization continues and the earth’s natural processes transform local problems into international issues, few societies are left untouched by major environmental problems.6) Acid rain, one of the most important environmental problems of all, cannot be seen. The invisible gases that cause acid rain usually come from automobiles or coal-burning power plants.7) Air pollution can have serious consequences for the health of human beings; the natural ecosystem is affected severely by it.