he..
He demonstrated a proclivity for entrepreneurship as a young man."The loneliness of the cold empty nights, brought forth the young poet's proclivity to darkness."(Improved sentence, Carson Bailey)
His proclivity for gambling and wasting money led to the breakup of his marriage.
I have decided to clean out my garage next week. - as a verb we are having a clean out at home on the weekend. - as a noun
When I prepare to write a speech, the idea summary will be found in the topic sentence.