The film started ten minutes ago.保持原意 The film _has_ _been_ _on_ for ten minutes.
The meeting ended half an hour ago.保持原意 The meeting _has_ _been_ _over_ for half hour.
The film started ten minutes ago.保持原意 The film _has_ _been_ _on_ for ten minutes.
The meeting ended half an hour ago.保持原意 The meeting _has_ _been_ _over_ for half hour.