Can I say,<br/><br/>(a) It was a happy because he<u><b> saved a life / live</b></u>. <br/><br/>(b) The drowning boy thanked Ben<b><u> for his help / thanked Ben for saving his life</u></b>. <br/><br/>(c) The little boy expressed (his) gratitute (to Ben) <u><b>for saving his life. </b></u>