The subjective case, or nominative case, is one of the 4
main cases in modern English. It is used for any noun or
pronoun that is
the subject of a verb.
Examples:
He
sang his poem. ("He" - subject of the verb "sang") Who
rang the bell? ("Who" - subject of the verb "rang") Maria
will open the school. ("Maria" -
subject of the verb phrase "will open")
Interactive example:
Further
to your letter, we
welcome the idea of staying here.
[show me the subjective case]