Question

Время паст !!
1) when we arrived , she (make) some coffee
2) his computer (to be) ready yesterday
3) your mother (to cook) supper yesterday
4) I (talk) over the phone for a whole hour when the Porter knocked the door

Answer 1

1)  When we arrived , she was making some coffee 
2)  His computer was ready yesterday 
3)  Your mother  cooked supper yesterday 
4)  I was talking over the phone for a whole hour when the Porter knocked the door