possessive case after with(out)/at/in/to/...

People trip over phrases like "with my friend's" or "between you and I" because they mix up preposition objects (me, him, them) and possessives (John's car, my friend's laptop). Read the short rules, check the quick tests, and use the rewrite templates below to fix sentences for work, school, and casual messages.

Quick answer

After a preposition, use an object pronoun (me, you, him, her, us, them) unless the phrase shows ownership or a location belonging to someone (John's house, my sister's car).

Use object pronouns after prepositions: with me, to her, between us.
Use a possessive + noun only to show ownership or location: at John's house, in Maria's kitchen.
If you hear "I" after a preposition, change it to "me" (e.g., "between you and I" → "between you and me").

Core rule

Preposition + object = object pronoun (me, him, them). Use a possessive only when something is owned or located: preposition + possessor's + noun.

Quick test: replace the entire phrase after the preposition with "me." If the sentence still makes sense, the object pronoun is correct.

Correct: "with me," "to him," "about them."
Possessive correct when ownership is shown: "in Maria's kitchen," "at John's house."
Wrong: "on the table's" - no ownership, so drop the apostrophe: "on the table."

Common prepositions and the form to use

Some prepositions almost always take object pronouns; others accept noun phrases and sometimes possessives when ownership or a specific location is meant.

Typically object pronouns after: with, to, for, about, from, between, among, without (e.g., "with her," "for them").
Noun or possessive when showing ownership/location: at, in, on (e.g., "at Jill's," "in my brother's car," "on the team's roster").
Never add an apostrophe to mark a preposition's object: use "on the door," not "on the door's."

Mixed wrong/right pairs (fast reference)

Read these aloud-correct versions usually sound cleaner and remove ambiguity between object and ownership.

Wrong: The choice is between you and I.
Right: The choice is between you and me.
Wrong: She left the notes with Sarah's.
Right: She left the notes with Sarah.
Wrong: We had dinner at my parents's.
Right: We had dinner at my parents' house.
Wrong: Can you come with John's?
Right: Can you come with John?
Wrong: Without nobody's help, I finished.
Right: Without anyone's help, I finished.
Wrong: She answered to my friend's question.
Right: She answered my friend's question.

Work: emails, notes, and reports (3 quick fixes)

Business writing needs clarity. Decide whether you mean a person as the recipient/companion or a place/possession tied to that person.

Wrong: Please coordinate with Jason's on the rollout.
Right: Please coordinate with Jason on the rollout.
Wrong: The budget meeting is between Laura and I.
Right: The budget meeting is between Laura and me.
Wrong: Send the report to Mark's.
Right: Send the report to Mark. (Or: Send the report to Mark's office.)

School: assignments, office hours, and group work (3 quick fixes)

Professors and graders notice case errors. Use object pronouns for preposition objects; use possessives only to indicate ownership or location.

Wrong: I left the draft with my teacher's.
Right: I left the draft with my teacher. (Or: I left the draft in my teacher's mailbox.)
Wrong: The choice for the project is between Tom and I.
Right: The choice for the project is between Tom and me.
Wrong: Can I meet at the professor's tomorrow? (meaning "meet with the professor")
Right: Can I meet with the professor tomorrow? (Use "professor's office" for location.)

Casual: texts, invites, and social posts (3 quick fixes)

Informal shorthand like "at John's" is fine among friends. In clearer writing, avoid ambiguous apostrophes on inanimate objects.

Wrong: Meet me with my friend's at 7?
Right: Meet me with my friend at 7? (Or: Meet me at my friend's at 7.)
Wrong: She's coming between you and I, right?
Right: She's coming between you and me, right?
Wrong: We're hanging at Jenny's's tonight.
Right: We're hanging at Jenny's tonight.

Step-by-step rewrites you can copy (templates + examples)

When unsure, use one of these templates and swap in names or nouns from your sentence.

Template A - Object needed: Preposition + [object pronoun/name] Example: Wrong: "She left it with Jake's." →
Right: "She left it with Jake." (if Jake held it).
Template B - Possession needed: Preposition + possessor + owned noun Example: Wrong: "I stayed at Anna." (unclear) →
Right: "I stayed at Anna's house."
Template C - Add the owned noun for clarity: Preposition + possessor's + noun Example: Wrong: "I did it with my friend's." →
Right: "I did it with my friend's help."

Rewrite:
Wrong: "They emailed to our manager's." →
Right: "They emailed our manager." or "They emailed the manager's office."
Rewrite:
Wrong: "I borrowed it from he." →
Right: "I borrowed it from him."
Rewrite:
Wrong: "Without nobody's help..." →
Right: "Without anyone's help..."
Rewrite:
Wrong: "On the table's are the keys." →
Right: "On the table are the keys."

Memory tricks, spacing, hyphenation, and punctuation pitfalls

Keep these quick checks when you edit: the case test, apostrophe purpose, and proper spacing.

Memory trick: "Preposition points at an object." If it points at a person or item directly, use the object pronoun (me/him/them).
Apostrophes: indicate ownership or contractions only. Don't use an apostrophe to mark a preposition's object.
Spacing: never insert a space before an apostrophe (wrong: Anna ' s).
Hyphenation: hyphens don't change possessives. If a possessive + hyphenated compound is awkward, rewrite (e.g., "the office of the manager-in-chief").
Case test: replace the phrase after the preposition with "me." If it still reads correctly, use an object pronoun.

Wrong: She left it on the table's.
Right: She left it on the table.
Wrong: We're meeting at Anna ' s.
Right: We're meeting at Anna's.

Similar mistakes to watch for

Fixing preposition + possessive errors often clears up related problems: who/whom after prepositions and choosing between possessive adjectives and pronouns.

Who vs whom: after a preposition use "whom" in formal writing: "To whom should I send this?" (Informal: "Who should I send this to?").
Mine/yours vs my/your: use "mine" when the pronoun stands alone-"That seat is mine" (not "for mine").
Subject vs object mix-ups: "She and I went" is subject use; after a preposition it becomes "between you and me" (object).

Wrong: Is this seat for mine?
Right: Is this seat for me? / Is this seat mine?
Wrong: To who should I give this?
Right: To whom should I give this? (formal) / Who should I give this to? (informal)

FAQ

Should I say "between you and I" or "between you and me"?

Say "between you and me." "Between" is a preposition and requires the object pronoun "me."

Is "at John's" acceptable?

"At John's" is informal shorthand for "at John's house." It's fine in casual contexts; in formal writing prefer "at John's house" or "at John's office" to be explicit.

When do I use "with me" vs "with my"?

Use "with me" when the preposition's object is the person. Use "with my" only before a noun the pronoun modifies (e.g., "with my laptop," "with my friend").

Can a preposition be followed by a possessive noun?

Yes-when you mean ownership or location (e.g., "in my sister's car"). Don't add an apostrophe when no ownership is intended (e.g., "on the table," not "on the table's").

Quick check before sending: one simple test?

Replace the phrase after the preposition with "me" (or "him/them"). If the sentence still makes sense, use the object pronoun. If it doesn't, you probably need a possessive + noun ("my friend's help," "at John's house").

Want a quick correction?

If a sentence feels uncertain, run the "replace with me" test or paste it into a checker that highlights pronoun-case errors and offers rewrite templates from above.