Having been reminded by the swearing in front of the cat thread, I meant to post this this morning.
I am aware that at some point, I will have to use new words for normal words that are swearwords.
I'll explain that in english 
Someone on an American TV show this morning said someone was a tool. I tried to explain to DD what a tool was in real English. The only words I could think of were knobhead, twat, dickhead.
There are many others.
So, I say "Oh shag" or "bollocks" when I drop something
i say knackered
shit
etc.
please help me remember the nice-not-swearing equivalents! (that are child-friendly - I don't think "imbecile" is any more helpful than "tool")