posted by Eloise .
Hello, just a quick homework question.
How do you say: working for my sister's buisness - is it sister's with an apostrophe s or just s or apostrophe after s?
If there is only one sister, then use sister's (the singular possessive form).
If there are two or more sisters, then use sisters' (the plural possessive form).
Also -- watch the spelling -- it's business. You have the s and the i reversed.
Thank you very much