Here are some substitutions for "we," depending on the context:
Formal:
* Us (object form): "The teacher gave us a homework assignment."
* Our (possessive): "This is our classroom."
* Ours (possessive pronoun): "This classroom is ours."
Informal:
* You guys (informal, plural): "You guys should come to the party."
* Y'all (Southern dialect, plural): "Y'all come back now, ya hear?"
* You all (formal, plural): "You all are invited to the wedding."
* Everyone (general, inclusive): "Everyone should be here by 5:00."
* The group (formal, referring to a specific group): "The group decided to go to the beach."
* The team (specific, referring to a team): "The team won the game."
Other:
* The author(s) (writing): "We would like to thank our editors."
* The researchers (scientific writing): "We found that..."
The best substitution for "we" depends on the specific context and the desired tone.