The sentence is :"One of the most important things in his life WAS/WERE his speeches".
I'm not sure about the concordance! Could you help me please?
The sentence is :"One of the most important things in his life WAS/WERE his speeches".
I'm not sure about the concordance! Could you help me please?
The answer here is 'was'. This is because you are referring to "One of the most important things..." (i.e. the singular).