1. Hung and his friend are playing badminton at the present.
2. my sisters were playing volleyball whilemy brother was playing soccer at this time yesterday 
3. while i was listening to music, i heard the doorbell
4. they were not sleeping during the.meeting last monday

Hung/ his friend play/ badminton/ the present
Hung and his friend are playing badminton at the present.
My sisters/ play/ volleyball/ while/ my brother/ play/ soccer/ this time/ yesterday
My sisters is playing volleyball while my brother was playing soccer in this time yesterday
While/ I/ listen/ to music/ I/ hear/ the doorbell
While I was listening to music, I was hearing the doorbell
They/ not sleep/ during/ meeting/ last monday
They were not sleeping during meeting last monday