english grammar

can someone explain three sentences describing preposition role, especially 'of'. I have tried dictionary to find role of preposition in the sentences. lastly, is there a way understand them easily. I was told that preposition indicate quality as describe below, but i'm unsure about bottom three sentences. I tried http://dictionary.reference.com/browse/o… to fit one of twelve definition to see where they fit. is there a way to easily understand sentence containing phrases 'of'
The preposition 'of' is indicating a quality or characteristic.

building of great height - very tall building
hole of great depth - very deep hole
cyanosis of increasing severity - cyanosis whose severity increases
bank balance of decreasing magnitude - bank balance that gets smaller

I'm unsure about the bottom sentences.



pneumonia that develops during the course of another disease.
second most cause of community pneumonia.
is composed of hundreds of closely related