Трансформируйте предложения в страдательный залог 1. Mr. Kelly brought up the matter of guarantee period. 2. We have

1. Mr. Kelly brought up  the matter of guarantee period. — The matter of guarantee period was brought up (Past Simple Passive) by Mr. Kelly. 2. We have already informed them about the prices and terms of payment. — They have already been informed (Present Perfect Passive) about the prices and terms of payment. 3. With the development of economic ties among the countries people do a great volume of business by mail. — With the development of economic ties among the countries a great volume of business is done (Present Simple Passive) by mail.