IV. Перепишите и переведите на русский язык следующие предложения. Подчеркните инфинитив и определите его функцию

1. The fuselage must be strong enough to withstand different loads acting on it in flight.

2. Engines to be employed in the field must be tested in the laboratory.

3. A central fuel-filling system is being used to facilitate easy handling of the aircraft.

4. To prevent foreign matter from entering the air intake the inlet are screened.

V. Перепишите и переведите на русский язык следующие предложения. Подчеркните причастия I и II, определите их функции:

1. The front portion of the wing is termed the leading edge, and the rear portion is called the trailing edge.

2. Monocoque is a structure made in the form of the single shell.

3. The forward movement of the control stick lowers the nose of the machine and raises the tail causing the aircraft to descend.

4. The data received provided important information on engine operation under a number of adverse conditions.

VI. Перепишите и переведите следующие предложения на русский язык, подчеркните герундий:

1. The power plant serves for developing power for flight and creating thrust.

2. The ailerons control the motion of the aeroplane about the longitudinal axis and assist in banking for a turn.

3. The purpose of the landing gear is to permit the airplane to take off and land without using special launching apparatus.

4. All the efforts of the designers and builders are usually aimed at achieving maximum safety.

VII. Перепишите и переведите следующие предложения с конструкцией It is (was)… that (who, which)…;

1. It was before the Second World War that rockets were largely experimental.

2. It is the diameter of the compressor that is to be changed.

3. It is the rudder that determines the horizontal direction of flight of an aeroplane.