Q:

He said to Sita, "When do you intend to pay back the money you borrowed from me?" 

• 1
  He enquired Sita when did she intend to pay back the money she borrowed from him
• 2
  He enquired Sita when she intended to pay back the money she borrowed from him
• 3
  He enquired Sita when she intended to pay back the money she had borrowed from him
• 4
  He enquired when Sita intended to pay back the money she borrowed from him