have a screw loose造句 1. She eats nothing but nuts: she must have a screw loose! 2. You have a screw loose. 3. He must have a screw loose, a picnic on such a rainy day. 4. Vanessa: Really? It'sounds terrible. You must have a screw loose. 5. She must have a screw loose, having a picnic on such a rainy day. 6. John must have a screw loose to quIt'such a good job.