This has been a much-requested grammar form! -다가 is a really useful grammar point that is used often in speech, so it would be really helpful to learn how to use it well.
I will cover four different “forms” of -다가, each of which has its own meaning(s). The four forms I’ll cover will be -다가, 아/어다가, -았/었다가 (-다가 attached to a verb conjugated to past tense), and -다가는. Also, while it’s not the same as the verb endings that use -다가, I’ll explain the particle -에다가 as well.