Question

Помогите пожалуйста ( Укажите предложение, в котором не названо лицо, совершившее действие. a) This scientist invented a new pneumonic system in 1989 b) A new pneumatic system was invented in 1989. c) Inventing a new pneumatic system he ran into a lot of problems.

Answer 1

a) This scientist invented a new pneumonic system in 1989. - ученый - действующее лицо
b) A new pneumatic system was invented in 1989. - Passive Voice - страдательный залог - не указано действующее лицо
c) Inventing a new pneumatic system he ran into a lot of problems. - он - действующее лицо

Answer 2

Answer:

The sentence that does not mention the person who performed the action is:

b) A new pneumatic system was invented in 1989.

This sentence does not specify who invented the new pneumatic system. It only states that the invention took place in 1989.