"He has an apple."
Translation:Hij heeft een appel.
In Dutch you conjugate the verb depending on the subject.
You do so in English too, though there are fewer conjugations:
The conjugations for "hebben" and "zijn":
This table comes from this thread about the simple present tense where you can find a lot more helpful information.
No, it can be "he" (unless doing a listen/speak question where it specifically asks for hij). The course is a little marked-pronoun heavy right now, so please report any sentences that do not allow "he" or other unmarked pronouns (and by unmarked, I mean the "e" ending pronouns). :)