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This grammar pattern is used to show the speaker’s strong determination or that a certain condition need to be satisfied. The speaker’s notice of the necessity is usually instantaneous.

● 피곤해서 저는 이제 가야겠어요. (I’m so tired that I should go now.)
● 글자가 잘 안 보여요. 좀 커야겠는데요. (I can’t see the letter. It needs to be big.)