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The past continuous indicates on ongoing activity while simple past indicates a finished action. Look and circle the correct form of the verb.
1. I was reading/ read a book when my mother was coming/ came in.
2. He was taking/ took a shower when the lights went/ were going off.
3. The rain started/ was starting to fall while we walked/ were walking in the park.
4. We were eating/ ate our dinner when someone knocked/ was knosking an the door.
5. The were walking/ walkid to school when suddenly they saw/ were seeing an unusual lught.

1. I was reading a book when my mother  came in.

2. He was taking a shower when the lights went off.

3. The rain started to fall while we were walking in the park.

4. We were eating our dinner when someone knocked on the door.

5. They were walking to school when suddenly they saw an unusual light.