ADJ. full | active | unwilling, willing She was an unwilling participant in his downfall. | key, leading, main, major | course | conference, seminar
VERB + PARTICIPANT attract Protests on 12 April attracted 100,000 participants.
PARTICIPANT + VERB attend sth
PREP. ~ in an active participant in the discussion
ADV. fully | actively
VERB + PARTICIPATE be able to, have the opportunity to | be allowed to, be encouraged to, be invited to Other countries were invited to participate in the project. | agree to | refuse to
PREP. in They will have the opportunity to participate actively in the decision-making process.