Expressing the purpose, the goal of something or action is important in any language. We often want to tell others for what purpose we are doing something. We want to tell them about our goals. In Korean, you have a few ways to express this and one of those forms is 위해서.
The form 위해서 is a form you use to express the goal or purpose of something. Essentially, it pretty much expresses the same as the form -(으)려고. However, the former does not suffer the limitations of the latter. So, it is used when you want to suggest doing something for the sake of something or someone.
가: 건강을 위해서 자기 전에 매일 비타민을 드세요.
나: 알겠어요. 할 거예요.
A: Take vitamins every day before you go to bed for your health.
B: All right, I’ll do so.
How To Use
The form 위해서 is a bit harder to use than the form -(으)려고 because you can use it with both verbs and nouns. When you want to use it with nouns, you have to attach the object particle -을/를 to the noun with which you use it. This turns the form into -을/를 위해서. As you probably have guessed, this follows the ‘batchim/no batchim’ rule. When the noun ends in a vowel, you use -를 위해서. If not, you use -을 우해서.
You can also use 위해서 with verbs. When you want to use it with verbs you need to nominalize that verb first. The easiest way to do so is with the nominalization form -기. This turns the form into -기 위해서. Because of -기, you needn’t worry over anything like the Korean irregular verbs. You just attach the entire thing to the verb stem and you are done. There is nothing to it really.
Lastly, it is entirely possible to drop the syllable 서 from 위해서, turning it into 위해. This is entirely acceptable and often done. Also keep in mind that unlike the form -(으)려고, you can use 위해서 with propositive endings, like -(으)ㅂ시다 and -(으)ㄹ까요, and imperative forms, like -지 마세요 and -아/어 주세요.