I thought so! Thank you for clearing this up. But how would I determine which tense is implied, if する is omitted? Like, in compound sentence, 「どこに行って、現場に急行した」, it's clear that it already happened because of the した in the end of the sentence, but in case した is omitted, then what? I'm sorry if my question seems naive, my grammar knowledge is pathetic. Also thank you for taking time to answer my question!