When I must use "of"?

[Tilt]

I really don't know when I need to use this thing. If you know let me know =))
Thanks so much my friend !
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We are what we repeatedly do.

[Torsten]

Hi Tilt,

As you know prepositions can be used in a multitude of instances. Think of any Russian preposition, would you be able to explain 'when to use it'? If you look the word 'of' up in a dictionary you will find a great number of examples showing how and when to use it. In addition, you should pay close attention to this preposition when you listen something in English or read English texts.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Tilt]

Torsten, I'm so pity about it but you are right=)
Anyway, many thanks to you !
_________________
We are what we repeatedly do.