There are a couple of ways to conjoin nouns and sentences in Korean.
One of the ways you can conjoin nouns is to use 과 or 와.
물과 밥만 필요해요 = I only need water and rice.
(물 = water. 과 = and. 밥 = rice. 만 = only. 필요해요 = need)
In the sentence above, 과 was used because 물 ends in a consonant.
케이크와 커피를 샀어요 = I bought cake and coffee.
(케이크 = cake. 와 = and. 커피 = coffee. 를 = object marking particle. 샀어요 = bought.)
Here, 와 was used as “and” because 켸이크 ends in a vowel.
Another way to conjoin nouns is to use 하고.
남동생하고 여동생이 있어요 = I have a younger brother and a younger sister.
(남동생 = younger brother. 하고 = and. 여동생 = younger sister. 이 = subject marking particle. 있어요 = have)
However, 하고 is used in informal situations. Unlike 과 and 와 it doesn’t matter as to whether 하고 follows a consonant or a vowel.
To conjoin sentences, use 그리고.
동수는 미국에 살았어요. 그리고 동수 여자 친구도 미국에 살았어요.
Dong Su lived in the U.S. and Dong Su’s girlfriend lived in the U.S. as well.
(동수 = Dong Su. 는 = topic marking particle. 미국 = U.S. 에 = locative particle. 살았어요 = lived.
그리고 = and. 동수 = Dong Su. 여자 친구 = girlfriend. 도 = as well. 미국 = U.S. 에 = locative particle. 살았어요 = lived)
그리고 can only be used to put sentences together, not nouns.
