What are the two forms of reflexive verbs?

Question

I have an assignment to write the two forms of the reflexive verb for each pronoun, with each given verb. I understand how to conjugate the pronouns with ea verb, but whats the second form or way to do this?? Example of how what I understand using Acostarse (to lie down)

Me acuesto Te acusestas Se acuesta nos acostamos ellos acuestan

Answer 1

The second form is to attach the reflexive pronoun to the infinitive:

acostarme

acostarte

etc.

Answer 2

Well, as well it can be a different tense.. How about it? For example; the verb irse;

1. Me voy ~ Me fuí
2. Te vas ~ Te fuiste
3. Se va ~ Se fue
4. Nos vamos ~ Nos fuimos
5. Os vaís ~ Os fuiesteis
6. Se van ~ Se fueron