ATTN: ANY FLUENT FRENCH-SPEAKERS!

Hello!

So I am playing a French woman in a partially-scripted Murder Mystery evening in a couple of weeks - the trouble is that while my half-arsed accent is consistent enough to pass muster, it is highly likely that some bastard will try to question me in French during the interrogation rounds. (We have three rounds where the suspects go up to audience tables and answer any question in-character.)

Can anybody give me a quick-and dirty phrase or two that I can use to acknowledge 'yes you're very clever, this character is indeed fluent, but we'll be doing this in English'? Some other characters also have sections in German, but we do at least have a fluent German-speaker on the production team. I don't want to resort to Babelfish!

What I would like to say:

I think this investigation should be conducted in English for the benefit of your fellow detectives, don't you?

Your accent is terrible.

I think we should speak English.

This is not relevant to the investigation.

At a pinch, I could just keep everything in English, but the whole idea is to immerse the audience as far as possible - even in an emergency we do not break character (there are 'assistant detectives' wandering about who intercede instead).

Any help will be met with utmost gratitude! And a favour back, if it's in my power - icons, drabbles, threads. I will try!

Cheers!