【正确答案】a before b的逆关系为b before a a start b的逆关系为b start a a meets b的逆关系为b meets a a overlap b的逆关系为b overlap a a during b的逆关系为b during a a finishes b的逆关系为b finishes a a equals b没有逆关系 各种时间关系及其逆关系如图时间关系如图所示。