Answer:
“Does” is used for singular subjects like “he,” “she,” “it,” “this,” “that,” or “John.” for example: 
she does her homework
John does not play basketball. 
It does not look real.
“Do” is used to form imperative sentences, or commands. Example: 
Do your homework.
imperative means a sentence that expresses a direct command, request, invitation, warning, or instruction.