Look

There are two kinds of coffee cups at work. Big and small. A woman today was pouring coffee into a big one.

"I like big cups," I said to her, in Swedish. 

"I like them too," she said in English.

In English? "You spoke in English," I said. "How come?"

"I thought you were an English speaker," she said.

"I am. You could tell in just a few words in Swedish?" I asked.

"You didn't need to say anything. I could tell by the way you looked."