Examples:

• How do you know this wasn't entirely his own idea?
• How do you know Khan is not in his room?
• How do you know she worked for a cleaning company?
• How do you know if the patient's telling the truth?
• How do you know the patient is an ISIS fighter?
• How do you know there's a RICO case against the Sons?
• How do you know if your luteal phase is too short?
• How do you know there's an Eye in my house?
• How do you know what's going on in the convent?
• How do you know the future hasn't already been changed?