"저는 현금으로 지불하고 싶어요."
Translation:I want to pay in cash.
The Sino-Korean words used in this sentence: 현금 (現金) 지불 (支拂)
現 (나타날 현, 지금 현, 옥빛 현)：appear, manifest, become visible
金 (쇠 금) ：gold; metals in general; money
支 (가를 지) ：disperse, pay; support; branch
拂 (떨칠 불) ： shake off
"shaking off the gold (money) that manifested itself in the current moment by paying"
Not that you asked me, but as a beginner, I used to learn a lot of unconjugated verbs (along with any kind of vocabulary actually), on Memrise mostly. It ends up being beneficial in the long term (as I am able to recognize a lot of words now), but maybe not the best use of my time in hindsight. I am still working with Memrise for vocabulary drills, but now I learn sentence chunks or complete sentences (mostly the ones I encounter during my Italki sessions). That way, I am able to quickly blurt out sentences with context (and associated conjugation).
So that would be my advice, focus on sentences with conjugated chunks rather than single unconjugated verbs. However, the mental process he is describing is still very useful and I go through it often when building my own sentences from scratch.