Question

Por favor
urgente
para mañana

Answer 1

He was swimming in the sea when he saw the shark.
They met while they were walking near the river. 
Peter had an accident when he was skiing. 
I wasn´t wearing a ciycle helmet when I fell off my bike. 
Our friends weren´t sleeping when phoned them. 
They didn´t see any people while they were travelling through the dessert. 

Answer 2

1.Was swimming.......Saw.....
2.Met.....were walking....
3.Had....was skiing.....
4.Wasn't wearing.....fell off....
5.weren't sleeping .....phoned.....
6.wasn't seening.....traveled....