I am a little confused about when a pronoun should and should not be added to the infinitive of a verb.
So below are some examples:
1) ¿Me compras un sandwich? - Will you buy me a sandwich?
2) ¿Podrías comprarme un sandwich? - Could you buy me a sandwich?
3) comprarme - buy me
4) me comprar - buy me
I think I remember reading that if you have two verbs next to each other the second should be in the infinitive form and that the pronoun can be added to the end of the infinitive or it can be placed at the before the first verb, like below. So is the line below the same as ¿Podrías comprarme un sandwich?
5) ¿Me podrías comprar? - Could you buy me?
Or is there a difference? It seems to me lines 1, 2 & 5 are the same apart from 2 & 5 being more polite.
Also if in line 2) there was no podrias, i.e. another verb would it be wrong to add the pronoun to the end of the infinitive verb?