V of n
The 'know' group
These verbs are concerned with getting or having knowledge.
I had heard of this band before, but I had never witnessed a performance or heard their music.
They also knew of the link between Lathan and the two journalists.
In the case of hear, the preposition of is sometimes followed by an '-ing' clause.
I've heard of looking on the bright side of life, but this is ridiculous!
In the case of hear and know, the preposition of is sometimes followed by a noun group and an '-ing' clause. This pattern is V of n -ing.
hear know learn
The president admitted that he did not know of any rebels having surrendered so far.