A business corporation is an institution established for the purpose of making profit. It is operated by individuals. Their shares of ownership are represented by stock certificates. A person who owns a stock certificate is called a stock-holder.
Задание :найдите предложения с пассивной конструкцией, определите видовременную форму глагола-сказуемого. Переведите предложения на русский язык.

1It is operated by individuals.-is operated-present simple passive.oно (акционерное общество)управляется физическими лицами.2their shares of ownership are represented by stock certificates.-are represented-present simple passive.их доли партнерства определяются(формулируются) сертификатами акций.