A toughie may knock at (door ..s).Logical formLearned from3 sentences. A bear may knock a person off a roof.Logical formLearned from3 sentences. A female may knock boots with some guy.Logical formLearned from3 sentences. A wind may be knocked clear.Logical formLearned from3 sentences. A guard may knock on a door.Logical formLearned from3 sentences. A wire may be knocked.Logical formLearned from3 sentences. A visitor may knock on a door.Logical formLearned from3 sentences. Everyone may knock on doors.Logical formLearned from3 sentences. A guest may knock at a door.Logical formLearned from3 sentences. A salesman may knock on a door.Logical formLearned from3 sentences. A maid may knock on a door.Logical formLearned from3 sentences. A jolt may knock a male from a perch.Logical formLearned from3 sentences. A punch may knock a kangaroo to the ground.Logical formLearned from3 sentences. Some trees may be knocked.Logical formLearned from3 sentences. A political-leader may be knocked off a ticket.Logical formLearned from3 sentences.