nation - типичные ошибки в английском со словом nation
Как научиться понимать Английский на слух? Изучать Английский играючи

Не правильно ❌ Правильно ✅ Пояснение
1. I couldn't tell what nation he came from.

1. I couldn't tell what country he came from.

1. nation = a large group of people, usually living in one area and having an Independent government
country = the area occupied by or associated with a nation
Note the alternative: 'I couldn't tell his national ity.'