"Upon entering my room, I saw a rat on the bed!"
Translation:En entrant dans ma chambre, j'ai vu un rat sur le lit !
It's a matter of transitivity. In French we don't enter something, we enter in something. Just like we answer to somebody who asked a question.
On the other side, "you have to do smth." translates to "tu dois faire qqch."
Oh thank you VERY much! Now I have to go look that up! (practices muttering oaths en français..)
Edit: YOU... you... YOU... I don't know... You whatever you are! You got me (and probably others who won't admit it), and you got me good. Well done!! :) I was not aware of the reference. Surprisingly, neither was my wife. But now I want to hear the Firesign Theatre's album about it.
Have a couple of lingots for your wit. And thank you for the learning experience, O invisible friend!