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 1) 1.She was surfing when the shark attacked her. 2.He was dancing at a party when he met his girlfriend. 3.I was having a picnic when i saw my sister 4.When they saw the shark they were swiming in the sea. 5.Susan arrived while i was having dinner. 6.He was playing football when he broke his leg. 7.I was waited for my friends when the bus arrived. 8.When i got back my mum was cooking dinner.   2) did you do went to a party did enjoyed  met was talking asked lives  does he know go to  11 не знаю, to see не употребляется в progressive  are going to