............... you ............ (exercise) yesterday morning when the strong wind ....... (start) ?
WERE you EXERCISING yesterday morning when the strong wind STARTED?
When mom ......... (come) home, we .................(sleeping). It was too late
When mom CAME home, we WERE SLEEPING. It was too late.
My parents ............... (work) in the backyard when tons of mosquitoes ........(bite) them.
My parents WERE WORKING in the backyard when tons of mosquitoes BIT them.
She ......... (see) the strange creature while she ........... (swim) in the river.
She SAW the strange creature while she WAS SWIMMING in the river.
While I ........(sit) at my desk, my phone suddenly .......(ring)
While I WAS SITTING at my desk, my phone suddenly RANG.
She ............. (have dinner) when the storm .......... (start).
She WAS HAVING DINNER when the storm STARTED
.......... your friend ............. (buy) clothes when the thief ......... (appear) in the store?
WAS your friend BUYING clothes when the thief APPEARED in the store?