Because if you don't add commas in your answer it wouldn't make sense
Answer:
1. Ann decided that she would <u>join</u> us later.
2. They <u>united</u> around that idea.
3. Mike dreams to <u>join</u> the navy.
4. The victory in the war <u>united</u> the people.
5. I hope you will <u>join</u> in for dinner.
Explanation:
I phrased the sentences so that they would be grammatically correct.
It’s both a adverb an adjective
