correct spelling of the following: two (sister's, sisters') bicycles??

two sisters' bicycles

Since both sisters have bicycles, you need to use the plural possessive.

To determine the correct spelling of the possessive form of "two sister(s') bicycles," we need to understand the concept of possessives and how they are applied in this context.

The possessive form is used to indicate ownership or possession. When a noun (like "sister") is singular, we generally add an apostrophe and an "s" ('s) to indicate possession. When the noun is plural and ends in "s," we typically only add an apostrophe (') after the "s" to indicate possession.

In the case of "two sisters' bicycles," "sisters" is plural, referring to more than one sister, so we would use the plural possessive form. Therefore, the correct spelling is "two sisters' bicycles."

Here's a breakdown of the logic behind it:

- "Two" indicates the quantity of bicycles.
- "Sisters" refers to more than one sister.
- The apostrophe goes after the word "sisters" because it is plural.
- We don't add an additional "s" after the apostrophe because "sisters" already ends in "s."

Remember, English grammar rules can sometimes have exceptions, but in this case, the possessive form of "two sisters' bicycles" is the correct spelling.