This article is from the The Terminator FAQ, by Karsten A. Loepelmann firstname.lastname@example.org with numerous contributions by others.
Arnold's voice is used in exactly 16 lines, with 17 sentences spoken. The
Terminator has two other lines, one with the voice of a police officer
overdubbed, and one with the voice of Sarah's mother overdubbed. There are
also many lines with the voice of Sarah's mother, and we learn that the
Terminator is actually saying them, but we don't see it onscreen.