The pronoun 'he' is a singular, subjective, personal pronoun that takes the place of a noun for a male.
The pronoun 'he' functions as the subject of a sentence or a clause.
Examples:
When George got to 19th Street, he got off the train. (the pronoun 'he' takes the place of the noun 'George' as the subject of the second part of the sentence)
The train that hetook stops at 19th Street. (the pronoun 'he' is the subject of the relative clause 'that he took')
