The plural of iris is irises.
The plural possessive of iris is irises' (apostrophe after the S).
Examples:
The irises' stems had all been trimmed before being placed in water.
His irises' size decreased in the bright light.
The singular possessive form for the noun iris is iris's.Example: The iris's color brings the garden to life.
The plural of iris is irises.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form is valleys. The plural possessive is valleys'.
The plural form is replies. The plural possessive is replies'.
The plural form is founders. The plural possessive is founders'.
No, it is singular, the possessive form of it is its. The plural form of it is they or them, and the possessive form is their.To answer the question directly: there is no such word as ITS'.
The plural form is branches. The plural possessive is branches'.
The plural possessive form of "mass" is "masses'".
The plural possessive is experiments'.
The plural form is ravines. The plural possessive is ravines'.
The plural form of the noun mouthful is mouthfuls.The plural possessive form is mouthfuls'.