Раскройте скобки .поставьте глагол в past continuous
1)When the phone rang,she (write) a letter
2)while we (have) a picnic,it started to rain
3)sally (work) when Joe had the car accident
4)While John (sleep) last night ,someone stole his car
5)Last night at 6 p.m.,I eat dinner
6)I (stydy) while he (make) dinner
7)while Ellen (read) ,Tim (watch)television
8)they (eat) dinner ,(discuss) their plans and (have) a good time

was, were + Ving 
1) was writing
2) were having
3) was working
4) was sleeping
5) ? скобок нет
6) studed, was making  
7) was reading, watched
8) were eating, discussing, having

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