The correct way to write the sentence is;
Ustedes tienen que hablar cuando yo les pregunte algo.
o
Usted tiene que hablar y responder la pregunta que les ago.
Un, an easy way to tell is through the ending vowel.
The 'o' in boligrafo is masculine, so the there are two automatic answers brought forward, 'un', and 'el'.
Then, in english, it would be like saying 'the' or 'a' whereas the is either 'el' or 'la', while a a 'un' or 'una' respectively.
atleticos is atletico in plural
If you have an iphome use the translator app and it works like a charm for these !
Hay una mesa en la sala .
this means:there is a table in the kitchen.
note that hay means there is.
