You can already say what happened. This week is about saying it in one sentence instead of three.
That sounds like vocabulary — learn a list of connectives, pick the one that means because or but. It is not. Korean connectives carry grammatical constraints that English conjunctions do not have, and those constraints are what actually break learners.
1 · The three constraints
| Constraint | The question | Example of a connective that fails it |
|---|---|---|
| Subject | Must the two clauses share a subject? | -느라고 requires the same subject |
| Tense | Can I put -었- before it? | -아/어서 refuses it |
| What follows | Can a command or suggestion come after? | -아/어서 refuses those too |