Forms of Other
Forms of other are used as either adjectives or pronouns:
SINGULAR: |
another book (is)
another is |
PLURAL: |
other books (are)
others (are) |
SINGULAR: |
the other book (is)
the other (is) |
PLURAL: |
the other books (are)
the others (are) |
Note that a final -s is used only for a plural pronoun (others). Another means one more in addition to the one(s) already mentioned. Other/others (without the) refer to several more in addition to the one(s) already mentioned. The other(s) has a different meaning (all that remains from a given number or specific group):
--I have three apartments. Two are mine. The other is yours.