It happened the first time over dinner. I was saying something to my husband, who grew up in Paris where we live, and suddenly couldn’t get the word out. The culprit was the “r.” For the previous few months, I had been trying to perfect the French “r.” My failure to do so was the last marker of my Americanness, and I could only do it if I concentrated, moving the sound backward in my mouth and exhaling at the same time. Now I was saying something in English — “reheat” or “rehash” — and the “r” was refusing to come forward. The word felt like a piece of dough stuck in my throat.