Listen my my baby
5. 나는 저 하늘을 높이 날고 있어
The first word of the fifth sentence is 나는, which means I, and the next word is 저, this is a kind of demonstrative adjective, and its meaning is that, or those in English, and the next word is 하늘을, 하늘 is the same as Sky, and 을 represents the objective case.
And the next word is 높이, which means High, and the last word is 날고 있어, which is transformed from 날다, and its meaning is to Fly, and the reason why 다 is changed into 고 있어 is because this expression represents present progressive, so 날고 있어 is I am flying, so 나는 저 하늘을 높이 날고 있어 is the same as I am flying high in that sky.
All right, we gonna go over the fifth sentence, here we go!