Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with the timer around 100, others might run out of time on their first try.
Now adding a scoreboard. If you mess up the sentence or just create a new one for the heck of it, you lose one point. After someone messes up, I will look at the sentences for the round that just ended, and give points to the person I consider having the best sentence. Since I'm the judge, I obviously won't be scored.