You would need to introduce a list.
For example you could have: My shopping list contains of; milk, bread, and yogurt.
Another purpose is to separate clauses.
Answer:
Once upon a time there was a cat.
Everyday the cat would run outside and hunt for prey.
One day, the cat spotted a huge dog that started to chase the cat.
Because of that the cat ran up a tree.
Because of that the dog tried to climb the tree.
Until finally, the dog realized it couldn't.
Explanation:
We use pronouns so that...
we are not repetitive.
they can provide variety.
they can provide an economy of words.
