12) Найдите и выделите ошибки в числе существительных. I have many fish in the aquarium in my study. Vasya likes watching the fish. Sometimes he hears some childrens playing in the yard, and jumps to the window to see them.

Ошибки в числе существительных:

• "childrens" нужно исправить на "children"

Предложение с исправленной ошибкой:

I have many fish in the aquarium in my study. Vasya likes watching the fish. Sometimes he hears some children playing in the yard, and jumps to the window to see them.