Раскрыть скобки и правильно поставить глагол (not forget) that even before i could walk, the wokshop (be) my playroom.
That even before not forget I could walk,the wok shop be my playroom
это неправильный ответ
Don't forget that even before I could walk,the workshop had been my playroom. контекст не совсем понятен))))