This is the 10893rd most frequent Russian word.
выполнял
"Performed" or "fulfilled."
The word 'выполнял' in this sentence means 'was completing,' and it implies that the speaker was actively working on tasks provided by the teacher.
Я выполнял задания учителя, чтобы подготовиться к экзамену.
I was completing the teacher's tasks to prepare for the exam.
Here, 'выполнял' translates as 'was carrying out,' indicating that the subject was performing his duties in accordance with expectations and responsibilities.
Он выполнял свои обязанности с полной ответственностью.
He carried out his duties with full responsibility.
In this case, 'выполняли' refers to 'completed,' suggesting the successful completion of a similar project in the past, showcasing its perfective aspect.