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1. I was reading a book when I heard a strange noise.
2. While we were swimming it started to rain.
3. I was getting ready for the party when my friend phoned me.
4. We were shopping when we saw them.
5. ?
6. I found this key while I was tidying up my room.
7. My father and I were playing chess when my cousins arrived.
8. My mom was having tea with her friend when I arrived.

I was reading a book when I had a strange noise
While we swimming it started to rain
I getting readying for the party when my friends phoned me