Theme
Theme, topic, question, text, content, motif, substance, gist, subject matter, issue, concern, thesis, point, thread, essence, and matter.
Participant
Branch of knowledge
Branch of knowledge, course of study, discipline, area, speciality, branch of study, course, field, specialism, and specialty.
Citizen
Citizen, native, inhabitant, voter, liegeman, subordinate, henchman, follower, national, resident, taxpayer, liege, vassal, underling, and retainer.
Susceptible to
Susceptible to, prone to, predisposed to, apt/likely to suffer from, in danger of, open to, susceptive of, liable to, vulnerable to, disposed to, easily affected by, at risk of, and wide open to.
Conditional on
Conditional on, dependent on, controlled by, resting on, contingent on, depending on, hingeing on, and hanging on.
Bound by
Bound by, answerable to, liable to, at the mercy of, constrained by, accountable to, and under the control of.
Put through
Put through, expose to, submit to, treat with, lay open to, and subject.