친구의 약속
My friend's promise

Full text (2 sentences)
제 친구 한 명이 오늘 갑자기 전화를 해서는 전에 했던 약속을 지키겠다고 하면서 만나자고 하더라고요. 그런데 저는 아무리 생각해 봐도 그 친구가 저한테 전에 무슨 약속을 했었는지 기억이 안 나서, 무슨 일인지 모르겠다고 했더니 친구가 갑자기 화를 내면서 전화를 끊어 버렸어요.

Key vocabulary & expressions
갑자기 = suddenly
약속을 지키다 = to keep a promise
기억이 안 나다 = to not remember
무슨 일인지 모르다 = to not know what’s going on; to not know what’s wrong
전화를 끊다 = to hang up

Linking parts
Subject + -이/가 + Noun + -을/를 해서는 = Subject did Noun and then ...
-겠다고 하면서 = saying that they would; saying that they are going to
-자고 하더라고요 = (someone) suggested doing (something); (someone) said “Let’s + Verb”
아무리 + Verb + -아/어/여 봐도 = no matter how much I + Verb
-다고 했더니 = I said … and then …

Translation
A friend of mine suddenly called me today and suggested meeting, saying that he would keep the promise he made before. But no matter how hard I thought, I couldn’t recall what kind of promise my friend made to me before, so I said I didn’t know what it was about and my friend suddenly got angry and hung up the phone.