Answer:
pronoun is usually placed just before the verb, excepted in formal interrogative form where it is placed after.
singular:
1st person : je or j' (when followed by a vowel)
2nd person: tu or t' (when followed by a vowel, in unformal way) (to be replaced by "vous" (plural) when using formal conversation)
3rd person: il (for male) or elle (for female) , sometimes "on" (a neutral form for "they", as "one says..." or (wrong usage often heard though) for "we")
plural:
1st person : nous
2nd person: vous
3rd person: ils (for groups including at least one male, or undetermined(neutral)) or elles (for females only)
Step-by-step explanation:
Contrary to some old languages, pronoun is not sufficient to indicate the verbal form. Verbs are "conjugués" (conjugated, declined) according to the tense of course but to the pronoun too. For more details on each verb see le-conjugueur.fr
Example :
je vais dehors. means "I'm going outside."
vais-je dehors ? means "am I going outside?"
est-ce que je vais dehors ? is unformal way to say "am I going outside?"
on va dehors. means "we are going outside".
HTH =)