Грамматика и Лексика

Преобразуйте, если это необходимо, слово NOT KNOW так, чтобы оно грамматически соответствовало содержанию текста.

I grew up in New York City. When I was six, my family moved to a new apartment not far from Coney Island. Although I had been to different summer camps with swimming pools, I still __________ how to swim.