C est de l'anglais svp traduisez C est le 90 merci

Yesterday , while i was taking my diner i heard a gunshot.
What have you done ? have you called the poliice ? 
Yes, and when they arrived i was discussing with my neighbour.
 A dead man was found on the fourth floor
He was washing the dishes when he got killed.

1) Yestersday, i had dinner when i heard a gunshot. 
3) Yes, and when they are arrived, i spoke to my neighbor.
4) They have found the man dead in 4 floor.