The plural form of the noun 'chalkboard' is chalkboards.
Example: They've replaced all of the chalkboards at the high school.
Blackboards
The noun 'blackboard' is a singular, common, concrete, compound noun; a word for a sheet of smooth, hard material (often dark slate), used in schools and lecture rooms for writing on with chalk; a word for a thing.
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.
The plural of "she" is "they", so the plural of "she had" is "they had".
The noun 'blackboard' is a singular, common, concrete, compound noun; a word for a sheet of smooth, hard material (often dark slate), used in schools and lecture rooms for writing on with chalk; a word for a thing.
You go to the blackboard (you go - plural "you" as if you are speaking to more than one person, as in asking the whole class to go to the blackboard.)
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.
The plural of "she" is "they", so the plural of "she had" is "they had".