English has two different pronoun forms depending on the job the pronoun is doing in a sentence: a possessive determiner (my, your, his, her, its, our, their) that shows ownership and always attaches to a noun, and an object pronoun (me, you, him, her, it, us, them) that stands in for the noun itself, usually as the receiver of an action. Mixing them up is one of the most common small errors in everyday writing.
Ask whether the pronoun is followed immediately by a noun it's describing ("their car," "our house," "his opinion") or whether it's standing alone as a receiver of an action or preposition ("give it to them," "wait for us," "listen to him"). Describing a noun → possessive. Standing alone → object.
| Possessive (+ noun) | Object (stands alone) |
|---|---|
| my book | give it to me |
| your idea | I told you |
| his answer | ask him |
| its color | look at it |
| our plan | wait for us |
| their house | I called them |
This isn't the possessive/object confusion above — it's a different trap. "Its" (no apostrophe) is the possessive form. "It's" (with an apostrophe) is always a contraction of "it is" or "it has," never a possessive.
If you can replace "it's" with "it is" and the sentence still makes sense, the apostrophe belongs. If not, you want "its."
These mix-ups slip through because both forms of each pair are real, correctly spelled words — spell-check won't catch them, only grammar-level context will. Proofread Bot checks pronoun usage in context and flags exactly this category of mistake.
Check your pronoun usage →