In the sentence:<br/><br/><span style="color:#0000ff;">The possessive case is chiefly used <b>of</b> people, countries or animals.</span><br/><br/>what is the function of the preposition <b><span style="color:#0000ff;">OF</span></b>. Does it work like <b><span style="color:#0000ff;">BY</span></b> here?