Question

20분 동안 쉬고 시작할 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 will rest for 20 minutes and then start

Front	20분 동안 쉬고 시작할 거예요
Back	I will rest for 20 minutes and then start
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 20분 동안 쉬고