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What does it mean to say someone hasn't eaten since morning?
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grape towel 746 What does it mean to say someone hasn't eaten since morning?

It means he hasn't eaten anything during a period starting from morning and continuing to the time he says it.

He may or may not have eaten in the morning, but the sentence does not give us any information about that.

He may or may not be eating now, as he says this, but the sentence does not give us any information about that either.

Both of these unknown factors have to be inferred from the context in which the sentence is said if it is even necessary to infer anything at all.

CJ