10. I saw a bad accident while I was driving home.

11. She found a ten dollar bill while she was walking home.

12. They were speeding when the accident happened.

13. The baby was sleeping when we got home from the party.

14. She broke a plaid while she was doing the dishes.

Form: S + was/were + V-ing

S +was/were + V-ing + ... 

S+wasn't/weren't + V-ing + ... 

Was/were + S + V-ing + .... ?

While có thể ở trước ,giữa hoặc sau câu .

10. was driving . 

11. was walking 

12.were speeding 

13. was sleeping 

14. was doing 

Cách dùng của các câu trên : Một hành động đang xảy ra trong quá khứ ở  một thời điểm nhất định thì một hành động khác xen vào . 

Vote +cảm ơn +ctlhn cho mk nha .Chúc bn học tốt .

#Muoi