In this sentence:
The ring on Leslie’s right hand was a gift from her boyfriend.
the main verb is the ver BE in its pas for WAS.
This is actually a pretty simple sentence, the only thing you have to be careful about is not confusing the genitive <em>'s </em> for a contracted form of <em>IS</em>
Long story short, WAS is the answer.
For having created new poetic expressions within the great American song tradition.
it is offensive becouse it is a type of culture