1) When I (knock) on the door, she (scream)

2) What (you-do) when you (see)
the stranger in your garden? I
(make) a cake.

3) (your mum-have) breakfast when I (ring) her? No She (sleep)​

When I knocked on the door, she was screaming.

What did you do when you saw the stranger in your garden? I was making a cake.

Was your mum having breakfast when I ringed her? No, she was sleeping.