Usage patterns
〈物〉の大部分を占めるto make up most of something
Most of this company's sales come from overseas markets.
〈人〉の大部分が〈動詞〉the majority of a group of people do/are something
The majority of the participants were students.
大部分は〈事〉だmost of it is ~
Most of the damage was caused by the typhoon.