They are used to show relationships between ideas. They can be used to join 2 or more sentences.
Answer:
Because the green police were after her.
Explanation:
Answer: Greg threw a ball at Rowleys bike and fell on the snow and broke his arm
Explanation: omg I love the series so much.
Noun- general item(s)
Pronoun- specific thing(s)
I hope this helps! :)