Learn -어지다 to say how something has changed, such as 추워졌어요, and to say what was done to something, such as 만들어졌어요.
By the end, you can add -아지다/-어지다/-해지다 to adjectives to describe a change, and add -어지다 to some verbs to say what was done to something, using 이/가 correctly.
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