если бы не Джон прикрепил значок на

если бы не Джон прикрепил значок на рубашку, я бы не узнал, что он участник конференции.

Результаты (английский) 1:

If not for John tacked badge on the shirt, I would not have learned that he was a participant of the Conference.

Результаты (английский) 2:

if not for John pinned icon on a shirt, I would not have learned that he is a member of the conference.

Результаты (английский) 3:

if john put a badge on his shirt, i don't know what he is member of the conference.