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Por exemplo que você acabou de tomar seu café da manhã. Um britânico perguntaria: “Have you finished breakfast yet?”. Por outro lado, é mais fácil um americano perguntar: “Did you finish breakfast yet?”.
Already and yet are usually used with the present perfect tense, but in North American English they can also be used with the simple past tense:I already did it. ◇ Did you eat yet?
However, this is much more common in spoken than in written English and some Americans do not consider it acceptable, even in speech. The present perfect is more common in North American English and almost always used in British English:I’ve already done it. ◇ Have you eaten yet?