4 Выполни письменно следующее задание: составь из слов верные предложения. У тебя должно получиться одно отрицательное и одно
утвердительное предложения, один общий во и один специальный. Все 4 предложения будут стоять в глагольном времени Past Progressive.
1 was, not, he, football, with us, yesterday, playing.
2 a book, at 7 o`clock, you, reading, were.
3 they, visiting, their grandad, were, in the morning?
4 Ben, what, yesterday evening, doing was?
2 What did A. Popov invent?
3 How did the invention affect radio devices?
4 What are the main parameters of radio receivers?
5 Does sensitivity mean a measure of the receiver's ability to receive weak signals?
6 Which parameter means the ability of the receiver to reject undesirable signals?
7 What does fidelity mean?
8 The principle of operation of the radio receiver is not very difficult understand, is it?
9 Are there various types of receivers?
10 Where are used communication receivers?
11 Are broadcast receivers used in radio, telephone and telegraph service or in sound and visual programms?