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.