подчеркните в каждом предложении глагол-сказуемое и определите его видо-временную форму и залог. 
1.Quantum mechanics has greatly influenced the nuclear theory.
2.The problem of the structure of matter is constantly occupying the minds of scientists.
3.Today many polymeric materials are produced on a massive scale.
4.Many compounds can be decomposed when they are acted upon by different forms of energy.

1.Quantum mechanics has greatly influenced the nuclear theory. Present Perfect Active2.The problem of the structure of matter is constantly occupying the minds of scientists. Present Continuous Active3.Today many polymeric materials are produced on a massive scale. Present Simple Passive4.Many compounds can be decomposed when they are acted upon by different forms of energy. Present Simple Passive