Questions about example sentences with, and the definition and usage of "Umm"

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A: Sorry. I laughed at the end. Is that really what you need? Jus say um?? Or is something else?

A: it kinda sounds like "엄"

A: 여자친구 아닌 것 같아요 ㅋㅋ. 몇달 전 모델하고 결혼했어요. 그 분 아니었어요. 그냥 비디오 나온 모델이에요.

A: It is hard to sing something in 10 seconds.

A: "Vibes" is short for 'vibrations' and is slang. A good vibe means that you get a good feeling, and a bad vibe is when you get a bad feeling. 'Bad vibe' is usually used when talking about something shady, sketchy, or odd.

A: it'll sound more natural if you say " when must we use 'either'?"! 😊

A: "I just said something bad happened"
Half of the sentence was past tense, so I made both of them past tense.