The word clay is both singular and plural.
'Clays' is already the plural form of clay. Clay is the singular.
The word clays is a noun. It is the plural form of the verb clay.
just clay. Or, if you are referring to various types of clay, the plural form would be "clays".
there is no plural word for clay. "Look at all that clay" "alot of clay" how much clay do you have?" get the point?
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
It has no plural form.
The plural form of rung is rungs.
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.