подчеркните в каждом из них глагол-сказуемое, определите его видовременную форму и залог.

1. He was one of the most prominent scientists and was working
much.
2. During many years he headed the Committee, the staff of which
was mainly composed of his pupils.
3. He will have studied this subject by next year.
4. Students were attracted to him not only because he was an
outstanding scientist but also because of his charming personality and
gentle manner.