Learn expressions used to ask someone a favor.
"제 컴퓨터 좀 봐주세요."
(Please take a look at my computer.)
Learn "-(으)ㄴ적이 있다/없다" which is an expression that indicates past experiences.
"컴퓨터실에서 근무한 적이 있어요."
(I worked at a computer lab before.)