Подчеркнуть в каждом предложении глагол-сказуемое и определить 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 many 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.