A few spanish questions?

Question

When do you attach a reflexive pronoun to the end of the verb vs. when you have to have it in front?

In what form(s) does a "go verb change? In what tense(s) do go verbs change?

Answer 1

When you are only using one verb, the reflexive pronoun MUST go at the beginning. Take the sentence "I brush my hair". In Spanish it would be "Me cepillo el cabello". The word "me" must go at the beginning. However, if there are to verbs within the sentence... like "I need to brush my hair". One has the option of placing it either at the beginning or the end. It's up to you, both are correct.

Me necesito cepillar el cabello

Necesito cepillarme el cabello

I really didn't understand the 2nd part of you question. Could you add some more details explaining what you mean?