Answer:
When my grandfather was a teenager, he [used to work] in a factory.
[Did you use to] live in a small town?
I [used to] have a cute little black dog, but sadly we had to sell him when we moved house.
How [did we use to communicate] before mobile phones?
When we ere at primary school, [we'd go] to the same place for our holidays every year.
I [didn't use to] like rap music, but now I love it.
Step-by-step explanation: