Examples:

• I came over to talk to lily, but now i'm not sure.
• Actually, i'm not sure that it would have.
• I'm dexter, and i'm not sure what i am.
• And i'm not sure the clients actually er vesee that.
• Sometimes i'm not sure what to wear on a date.
• Well, i'm not sure if i want to see her.
• If she doesn't, i'm not sure that's my fault.
• Well, i'm not sure i'm the cure for that, commander.