When I got back my mom had cooked dinner.
Nicked was dancing at a party when he met his gf. 
What did you do last weekend?
I finished that series on netflix. I did not like the ending.
Linda was surfing when the shark attacked her. 
I was talking to my friend on the phone when the bus arrived. 
When the earthquake happened, they were sleeping. 
What did she do at 9:00 last night?
What did she see while she was swimming?
I think these are right but I could be wrong