Ричард начала проявлять интерес к м

Ричард начала проявлять интерес к математике, когда учился в школе

Результаты (английский) 1:

Richard began to show an interest in mathematics when he was in school

Результаты (английский) 2:

Richard began to take an interest in mathematics when he was in high school.

Результаты (английский) 3:

When Richard became interested in mathematics, he was at school.