`1)` Matt phoned while we were having dinner.

`2)` The doorbell rang while i was watching TV

`3)` We saw an accident while we were shopping in Big C

`4)` Anna fell asleep while she watching TV

`5)` The television was on but nobody was watching it 

Chúc bạn học tốt !!
@Katniss

đây là bài tự viết nhưng phải theo công thức nên mình lm cáh của mình

thì past countinious ta có cấu trúc

s + was / were + v-ing

s + wasn't / weren't + v-ing

was / were + s +v-ing

matt phoned while we were playing basketball

the doorball rang while i was studying

anna felt assleep while she was doing her homework

the television was on but nobody was watching it