In this question I asked about different usage of "that" and its possible corresponding with Persian sentences,
But still I don't know how English may say sentences like:
1) We were walking, that suddenly a car stopped in front of us...
2) I was reading a book that he entered the room.
3) I was cleaning it that it was broke
4) He was driving that he went to sleep and the car was crushed
They almost mean, as we were doing something, something happened.