Задание 4. Преобразуйте предложения из утвердительной формы в вопросительную и отрицательную формы. Переведите предложения на русский язык

1. The operation of a receiving station is influenced by a number of factors. 2 Magnetron is a vacuum tube whose current is affected by a magnetic field. 3. Valve radio sets were followed by the transistor radio sets. 4. Cosmic radiation is influenced by some phenomena of nature. 5. This method has been referred to in an earlier paper. 6. This engineer's design was much spoken of at the conference. 7. Long-range communication systems are being successfully used in our country. 8. This system lifetime was greatly increased due to the application of semiconductors.

Задание 5. Заполните пропуски предлогами "by" или "with".

1. The theory was presented ___ the young scientist. 2. The value of current is measured ___ an ammeter. 3. This experiment was conducted ___ our research workers. 4. The rate of chemical reactions is influenced ___ many factors. 5. The potential between two points of a circuit is measured ___ a voltmeter.

Задание 6. Составьте вопросительные предложения из приведенных ниже слов и словосочетаний:

1. been/ the last several years/ attempts/ have/ to classify/ the elementary/ particles/ during/ some/ made/ haven’t/ they?

2. of scientists/ has/ to space research/ been/ the contribution/ greatly appreciated?

3. has/ what/ been/ quite well/ analysed/ in terms of the quantum theory?

4. have/ in this paper/ described/ classical ones/ the studies/ become?