Question

요리하고 청소할 거예요 As a sequential connective meaning 'and (then)', -고 links two clauses describing actions that take place sequentially. In such usage, -고 normally occurs by itself without the past tense marker.One possible situation for -고 to appear affixed by the past tense marker is when talking about two sequential past events separated from each other by a significant amount of time. In such cases, the first clause often leads to the possibility of the second clause to take place.

Accepted Answer

I'm going to cook and (then) clean up

Front	요리하고 청소할 거예요
Back	I'm going to cook and (then) clean up
Notes	As a sequential connective meaning 'and (then)', -고 links two clauses describing actions that take place sequentially. In such usage, -고 normally occurs by itself without the past tense marker. One possible situation for -고 to appear affixed by the past tense marker is when talking about two sequential past events separated from each other by a significant amount of time. In such cases, the first clause often leads to the possibility of the second clause to take place.

고 Past Sequential Tense Clause 요리하고 청소할 거예요