Utiliser "nag at" dans une phrase

1. He tried to dismiss the Olivera case from his mind but something continued to nag at him

2. And the town’s citizens still talked of the day the sheriff had ridden his flea-bitten nag at the front of Henrietta Kojak-Moon’s funeral procession, shooting his gun in the air and hollering “God Bless America!” thinking he was leading a Fourth of July parade

3. There was something in his face that caused doubt to nag at her insides

4. Stephen could not respond to her merry mood; his anxiety was to steer the conversation away from Simeon, and he had run against a snag at the start