Examples:

• Do you understand what this is doing to my plants?
• Do you understand that everything else in my life works?
• Do you understand why he thinks that you sabotaged the relationship?
• Do you understand what's happened to your brother, Terry?
• Do you understand what I'm trying to say here, George?
• Do you understand how important that is in our world?
• Do you understand the risks of living with one kidney?
• Do you understand that the world is about to end?
• Do you understand what's going to happen in a couple of days?
• Do you understand what kind of man buys these pictures?