IV. Quyidagi gaplarning kesimini Past Indefiniteda yoki Past Perfectda qo’ying 1. In 1895 Popov … (to invent) the radio. 2. When I came to Moscow, my friends … already (to be) there. 3. We … (to study) this material before we began to work in the laboratory. 4. They … (to discover) this element this century. 5. When we came to the station, our train … already (to go). 6. When they entered the hall, the lecture … already (to begin). 7. By the time we came to see him he … (to leave) for Moscow. 8. We … (to pass) our final exams by that time. 9. When I entered the room my friends … already … ( to dress). 10. We … (to come) to the station before the delegation came.
