The knife's edge had been dulled when it hit the rock.
Knife's is singular posessive.
The knives' edges had been dulled when they hit the rock.
Knives' is plural posessive.
The singular possessive form for the noun knife is knife's.The plural form is knives; the plural possessive form is knives'.
Knives' is the plural possessive form of knife.
The singular possessive form for knife is knife's.The plural possessive form for knife is knives'.The knives' edges were dull from cutting rope.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The plural of knife is knives.The plural possessive is knives', as in the knives' handles were muddy.
The plural possessive is knives'Knives'
The singular possessive of "ant" is "ant's" and the plural possessive is "ants'".
The singular possessive is biker's; the plural possessive is bikers'.
Niece's is a singular possessive noun. niece - singular nieces - plural niece's - singular possessive nieces' - plural possessive
The word sisters' is plural possessive. The singular is sister, singular possessive is sister's; the plural is sisters, the plural possessive is sisters'.
The plural possessive is knives'Knives'
The singular possessive is army's.The plural possessive is armies'.