Silks is the plural of silk
The plural form for the singular hat is hats.The plural possessive form is hats'.Example: The hat's band was black silk.
Materials like cotton, wool, silk and challis don't have plural form because they are uncountable nouns.
The plural of vassal is vassals. As in "our vassals have sent us gifts of silk".
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.