2 Complete the sentences with the correct passive form of the verbs in brackets. 1 Antibiotics (prescribe) by doctors to fight disease for many years. 2 What would our lives be like if X-ray machines (not invent)? 3 Scientists believe that a vaccine to prevent malaria (develop) soon. 4 In the past, many patients (infect) each year in dirty hospitals. 5 Natural plant remedies for illnesses (discover) all the time. 6 Anaesthetics (not use) in operations until the 19th century.
1 Antibiotics ARE PRESCRIBED by doctors to fight disease for many years.
2 What would our lives be like if X-ray machines WERE NOT INVENTED?
3 Scientists believe that a vaccine to prevent malaria WILL BE DEVELOPED soon.
4 In the past, many patients WERE INFECTED each year in dirty hospitals.
5 Natural plant remedies for illnesses ARE DISCOVERED all the time.
6 Anaesthetics WERE NOT USED in operations until the 19th century.