Two other words that you can use in similar situations as 전 and 후 are 안 and 이내. You already know the word "안" can be used in sentences to mean "inside:"
나는 집 안에 있다 - I am inside the house
If 안/이내 are placed after an indication of time, they have the meaning of "within" that time period. For example:
나는 5년 이내에 외국어 다섯 개를 배우고 싶어 - I want to learn five languages within 5 years
나는 5년 안에 외국어 다섯 개를 배우고 싶어 - I want to learn five languages within 5 years우리는 1년 이내 결혼할 거예요 - We will get married within one year
우리는 1년 안에 결혼할 거예요 - We will get married within one year
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LEARN KOREAN (한국어) [GRAMMAR] #1
De TodoThis is book #1 for the Korean Language series. Try to understand all of the notes in this book before you proceed to the next one. Good luck ! This book contains Korean grammar. Try to understand it so that you can understand how to make a sentence...