why you sit here vs why do you sit here

Some examples from the web:

• Why you sit here every day?
• Why do you sit here in the dark?
• Why do you sit here answering every one of those questions?
• Why don't you sit here with me, and we'll receive your confession.
• Why do not you sit here?
• Well, I can see why you like to sit here.
• Why do you sit here with your bellies full - while famine grips the city?
• Why don't you sit here and watch?
• Why don't you sit here awhile?
• Why don't you sit here, Bree?
• Why don't you sit here and enjoy your lunch?
• Why don't you sit here and hold hands and try to figure it out.
• Why don't you sit here in my chair and make yourself comfortable.
• Why don't you sit here a moment, think about that before you go back to work?
• Why don't you just sit here, pumpkin, and think about that for a second.
• So why don't you just sit here and ponder your love for law enforcement, while he goes and searches your boat.
• Why don't you two sit here and devote a few minutes to talking constructively about Jane.
• Why did you sit down here?
• Why would you want to sit here?
• Why don't you sit over here, my little white brother.

Some examples from the web:

• Why do you sit here in the dark?
• Why do you sit here answering every one of those questions?
• Why do you sit here with your bellies full - while famine grips the city?
• Why don't you sit here with me, and we'll receive your confession.
• Why do not you sit here?
• Why don't you sit here and watch?
• Why don't you sit here awhile?
• Why don't you sit here, Bree?
• Why don't you sit here and enjoy your lunch?
• Why don't you sit here and hold hands and try to figure it out.
• Why don't you sit here in my chair and make yourself comfortable.
• Why don't you sit here a moment, think about that before you go back to work?
• Why don't you just sit here, pumpkin, and think about that for a second.
• So why don't you just sit here and ponder your love for law enforcement, while he goes and searches your boat.
• Why don't you two sit here and devote a few minutes to talking constructively about Jane.
• Why do you just sit here and let her yell at him?
• Why don't you sit over here, my little white brother.
• Why don't you have a sit here and reflect our eventful day.
• Why don't you just sit here, pumpkin, and think about that for a second.
• All right, sweetie, why don't you sit over here, okay?