알고 있었어요?

Question 1

있다

Answer 1

When you add another verb with 있다 or 없다 It literally means that the verb is this.

Ex: 저는 돈이 많이 있어요 or
저는 돈이 [많다 +있어요] = 많아요

Question 2

한테

Answer 2

한테 means from or to about someone who’s usually not present. Depending on wich verb it’s used with can mean that you’re doing or giving something to someone or something OR getting something from someone or something

Ex:
저는 엄마한테 선물을 줬어요. [to]
저는 엄마한테 선물을 받았어요. [from]

Question 3

~에서 일어나다

Answer 3

Add a noun in front to say you’re getting up from that noun