Dominic couldn't swim well when he was 10 years old, so he took some swimming lessons.

Доминик не умел хорошо плавать, когда ему было 10 лет, поэтому он брал уроки плавания.

Глагол could (couldn't) означает физическую способность (или неспособность) в прошлом.

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Ответ:

Dominic used to swim well when she was 10 years old, so he took some swimming lessons