"You may already be speaking French!"
Students may be surprised to learn that many everyday "English" words are actually French. "Café, filet mignon, cul-de-sac, genre, etc." can often be heard outside the French classroom. Sharing some of these with your FSL students might let them see how much "la belle langue" has influenced English!
Also: here's a great poster to download and print, or share on your class webpage: