
Somebody has arrived
Expectation
Implies anticipation of someone's arrival, often used when a person joins a gathering.

We've set the table since somebody has arrived.
Alertness
Indicates the need to be attentive, usually because a new person enters a space unexpectedly.

Quiet down, somebody has arrived.
Simple Awareness
Used to notify others present that a new person is on the premises without additional implications.

Oh, somebody has arrived; I'll go check.
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