Pardon my Français, but I think you're mistaken.

Pardon mon français, but could you repeat that?

Pardon my Francais, but I think you're mistaken.

Pardon mon Francais, but I think you meant to say 'excuse my French'.

Pardon my French, but that was a terrible idea.

Excuse my français, but I think you're mistaken.

Pardonnez my French, but that movie was terrible.

Pardoning my French, but that movie was terrible.

He pardons my French.

I pardoned my French.