F1 student, resident alien, no income

I am an F1 student and I am staying in the US for more than 6 years (my case considered as a resident). However, I didn't receive any income in the US. I filed my 8843 form. Do I need to file any tax return, since I am considered as a resident?  

 

Also, I would like to ask. What is the difference between a 1040 and tax return? can I file a 1040 without tax return? beside 1040 do I need to file any other form?