Grammar: Future Indefinite Tense. Text: Turboprops New words to the text

III. Write how can you answer in these situation.

Example: What must you say if you want to know the time?

If I want to know the time I must ask: "What is the time?"

1. What must you say when your watch is slow? 2. What must you say if you want a person to have some drink? 3 what must you say when you want to enter the room? 4. What must you say when the plane is to take off?

IV.Translate the sentences with pay attention translation subject(revision)

1. The aircraft with a total seating capacity of more than 5 persons must be provided with at least one emergency exit. 2. Different types of unguided missiles have been developed. 3. Our Sun and its planets are called the solar system. 4. In this chapter emphasis is placed upon fuselages, wings, and control surfaces, and considerable attention is given to cockpits, cabins, compartments, canopies, windows, landing gears and power-plant structural parts. It is not intended to describe the details of all aircraft or all the details of any particular aircraft. 5. Launch vehicles are usually made up of several stages. 6. A full scale model of the astronaut's space suit has been constructed and tested. 7. The behavior of the system is strongly influenced by gravity.

V. Answer the question to the verbs.

1. In what case does a turbojet become a turboprop? 2. What engine is more complicated and heavier, a turboprop or a turbojet? 3. What can you say of the propulsive efficiency of a turboprop and a turbojet in normal cruising-speed ranges?