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Определите время сказуемого в следующих предложениях. Подчеркните сказуемое полностью
1. The conductivity usually increases with temperature.
2. Silicon has been the backbone of the semiconductor industry since the inception of transistors.
3. The new microelectronic devices will operate at reduced supply voltages.
4. Before the invention of the integrated circuit the electronic industry had studied the properties of insulating materials.
5. In 1966 C.A. Mead demonstrated the possibility of transistors.
6. At present most scientists are working in groups, since the days of great individual discoveries are in the past.