The plural form for the pronoun 'it' is 'they' for the subject and 'them' for the object of a sentence or clause; fro example:
There is a book on my desk, it is a math book.
There are books on my desk, they are math books.
There are books on my desk, I just bought them.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
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 "is" is "are."
The plural form of "was" is "were."
The plural form of "I" is "we."
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.
The plural form of the demonstrative pronoun 'that' is those.
Trenches is the plural form.
The plural form is metres.