연결 리스트 (Linked List) 연결 리스트는 데이터 요소의 선형 집합으로, 데이터의 순서가 메모리에 물리적인 순서대로 저장되지는 않는다. 컴퓨터과학에서 배열과 함께 가장 기본이 되는 대표적인 선형 자료구조 중 하나로, 다양한 추상 자료형 (Abstract Data Type, ADT) 구현의 기반이 된다. 연결 리스트는 배열과는 달리 특정...

Unit 044. is it …? have you …? do they …? etc. (questions 1) A In questions, the first verb (is/are/have etc.) is before the subject: I am late. Am I late? That seat i...

Unit 040. I am, I don’t etc. A She isn’t tired, but he is. He likes tea, but she doesn’t In these examples, it is not necessary to repeat some words. You can use these verbs in the sa...

Unit 037. there is there are A There’s a man on the roof. There’s a train at 10.30. There are seven days in a week. There’s a big tree in the garden. There’s nothing on ...

Unit 029. might A Where are you going for your holidays? I’m not sure. I might go to New York. He might go to New York. (= it is possible that he will go to New York...

Unit 025. What are you doing tomorrow? A They are playing tennis (now). He is playing tennis tomorrow. We use be + -ing (present continuous) for something happening now: ...

Unit 023. be/have/do in present and past tenses A Please be quiet. I’m working. It isn’t raining at the moment. What are you doing this evening? I was working when she arrive...

Unit 021. is done, was done (passive 1) A The office is cleaned every day. The office was cleaned yesterday. Somebody cleans the office every day. (active) The office is clea...

Unit 015. I have done (present perfect 1) A His shoes are dirty. He’s cleaning his shoes. He has cleaned his shoes. (= his shoes are clean now) They are at home....

Unit 010. was/were A Now Robert is at work. At midnight last night he wasn’t at work. He was in bed. He was asleep. I am tired. (now) / I was tired last night. Where is K...