"We"
* Subject of the verb: When "we" is the main actor in the sentence, it's used as the subject.
* Example: We went to the park.
* Compound subject: When "we" is part of a group of actors, it's still the subject.
* Example: John and we went to the park.
"Us"
* Object of the verb: When "us" is the recipient of the action, it's the object.
* Example: The teacher gave us homework.
* Object of a preposition: When "us" follows a preposition (e.g., to, for, with), it's the object of the preposition.
* Example: She gave the book to us.
* After "it is" or "it was": In this case, "us" is the subject complement.
* Example: It was us who won the game.
Tips:
* Substitute "we" with "I" and "us" with "me" to check the grammatical correctness. If "I" works, use "we." If "me" works, use "us."
* Pay attention to the verb: The verb will often tell you if you need a subject ("we") or an object ("us").
Examples:
* Correct: "We are going to the store." (Subject)
* Incorrect: "The store is close to we." (Should be "us")
* Correct: "The cashier gave us our change." (Object)
* Correct: "The manager talked to us about the problem." (Object of the preposition "to")
If you're still unsure about using "we" or "us," it's always a good idea to consult a grammar guide or ask a trusted language expert.