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A friend of mine asked this based on her homework, and while I know when to use/not to use DID, I'm unable to explain it to her. I'm hoping that someone can help me on this
The original sentence is like this:
Did you buy that bag while I was looking after the children?
and so she asked as for why couldn't she write it as
"Were you buying that bag while I was looking after the children?"
neither can she see the difference between
He was breaking his leg when he skied.
and He broke his leg when he skied.
and
"I was looking out of the window and saw that people were walking in the park."
vs "I looked of the window and saw that people were walking in the park."
It would be appreciated if someone can shed some lights onto this.