Перефразируйте следующие предложения, используя конструкцию complex object. 1. I believe they…

complex object — сложное дополнение. Существительное или местоимение плюс инфинитив без to. 1- I believe them be very good at physics and other pure sciences.2- when he opened the window he heard the birds be singing in the garden.3- i heard his name be mentioned several times during the conversation.4- i saw him open the door and leave the room.