Verb of Existence (없어요 ~ 있어요)

I am yet to learn more about verbs in 한극.   The verb indicating existence or non-existence have been introduced first,  these are -있어요 and -없어요 respectively.  The dash before the verb indicates it cannot stand alone it should be preceeded by a word usually a noun.

This word ending is very striking as I usually hear them on songs and conversations in dramas and movies.

Samples:

책이 있어요 –> there is a book 

펜이 없어요 –> there is no pen