1) I was cleaning my bedroom when a) Lana knocked the door b) Lana was knocking the door. 2) The students were doing an exercise when a) the bell rang b) the bell was ringing 3) I saw an accident while a) I waited at the bus stop. b) I will wait at the bus stop. c) I was waiting at the bus stop. 4) While she was writing an email, a) her computer turned off. b) her computer was turning off. 5) He fell down _____________ he was climbing a tree. a) while b) when 6) _______ my mom came home, my brother was playing. a) when b) while

Past Progressive & Past Simple

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