Bankruptcy explains the subject, so it is an adjective as a predicative.

So go is a copulative verb.

This is the main family table structure

The copula and predicative are an inseparable whole.

In other words, there must be a predicate if there is a copula, and the verb before the predicate must be a copula.

Predicate is a sentence component that explains the subject after the copula verb.

This is the basis for judging the structure of the main family table.

For example, milk has gone bad. The milk has gone bad. Bad is an adjective that explains the subject, so it is a predicate.

Then the preceding verb got must be a copula, not an action verb.