Задание 1. Поставьте предложения в отрицательную форму. К выделенным словам поставьте специальные вопросы.
P.S Слова в скобках к которым нужно задать специальный вопрос
1) He grants us a 3% discount (for cash payment).
2) You should have (called) your friend long ago.
3) (He) knew what was wrong with the machine.
4) The manager will be able to (receive) to Mr. A. only in the afternoon.
5) I had to sign this (agreement) only on Monday.
6) They have to transport their products by rail.
7) Participation in fairs helps (promote our goods).