через два года они стали не просто

через два года они стали не просто классом, они стали большой семьей.

Результаты (английский) 1:

two years later they became not just a class, they were a big family.

Результаты (английский) 2:

Two years later they became not just a class, they have a large family.

Результаты (английский) 3:

two years later, they became not just a class, they are a big family.