Помогите пожалуйста!Most barristers are professional advocates earning their living by the

Помогите пожалуйста!
Most barristers are professional advocates earning their living by the presentation of civil and criminal cases in court. A barrister must be capable of prosecuting in a criminal case one day, and defending an accused person the next, or of preparing the pleadings and taking the case for a plaintiff in a civil action one day, and doing the same for a defendant the next.
Нужно найти часть речи слов в суффиксом ing.