Why is this in a past tense section?
It is not in the past tense. Read it again
Why is "We go behind your mother." not accepted?
I want to know too. Just got dinged for it
Why not "nos vamos atrás DA sua mãe"?
It's also right.
Needs reporting
Why is it not "atrás DA sua mãe"?
Also right.
How would be ,,we are going behind your mom" then?
Literally that would be the case, but we use "ir atrás" as "look for"
We isn't "we follow..." accepted?
behind is also correct, isn't it
Could it also mean "We go after his/her mother"?