-(으)세요 is used in conjunction with a verb to ask or command someone to do something politely. Noun - is used to request someone to give an item.
여기 앉으세요. or 잠깐만 기다리세요.
When counting people or items, use 하나, 둘, 셋, 넷… When this is the case, the number must come after the noun, such as 빵 하나.
볼펜이 하나 있어요. or 샌드위치 둘 주세요.
개, 병, 잔, 그릇 is used to count the number of objects. The name of the object is mentioned first followed by the numerator, and finally, the unit noun such as 개, 병, 잔, 그릇. Use numeral determiners.
빵 한 개 주세요. or 사이다가 두 병 있어요. or 홍차 세 잔 주세요. or 비빔밥 네 그릇 주세요.
-하고 is used to connect two or more nouns. Be careful not to use it when connecting two sentences. -과/와 and -하고 have the same meaning and are used to two or more nouns, but - is used more often when writing. -과/와 and -하고 have the same meaning and are used to two or more nouns, but - is used more often when writing.
밥과 김치 or 지우개와 연필