Answer: Tú no te cepillas el pelo por la noche.
Explanation: We must complete the sentence:
"Tú no ___ _______________el pelo por la noche."
With the reflexive verb corresponding to "cepillarse" (which means something like "brush yourself")
Because the verbal person is "tú", the correct pronoun will be "te"
And the correct present of the reflexive verb will be:
"Te cepillas"
So the complete sentence is:
Tú no te cepillas el pelo por la noche.
