The plural of the noun knife is knives.
The plural possessive form is knives'
Example: These knives' maker is a master craftsman.
The plural of knife is knives.The plural possessive is knives', as in the knives' handles were muddy.
The singular possessive form for the noun knife is knife's.The plural form is knives; the plural possessive form is knives'.
Radios' is the plural possessive of the singular noun radio.
Knives' is the plural possessive form of knife.
The possessive noun form of knife is knife's, e.g. "That knife's blade is very sharp."The possessive plural form would be knives', e.g. "Those knives' blades need to be sharpened."
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.
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.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.