Which one is grammatically correct?

  • Part of my responsibilities was to...
  • Part of my responsibilities were to...
I'm leaning towards "was" but not sure...
MrAtheistWhich one is grammatically correct?

Part of my responsibilities was...

One of my responsibilities was...

Why not learn the art of rephrasing constructions you are not sure of?

'My responsibilities included. . . '

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Among my duties were or was

banana fold 466

Among my duties were or was

Among my duties was sweeping the floor. (one thing)
Among my duties were sweeping the floor and polishing the silver. (more than one thing)