I thought you were American.
Surely you are American?
Aren't you American?
You must surely be an American.
2012年8月6日
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One might say, "I take it that you are American".
"You look like an American".
"You must be American".
"No doubt you are American".
2012年8月6日
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-"Are you American?"
-"Are you an American?"
-"You look like you're American, are you?"
-"I saw you over there and thought you could be American, are you?" (The last two sentences aren't direct translations, but they get to the point).