A) Past Indefinite; b) Future Indefinite.

Model 1: He must learn the new words.

He had to learn the new words.

He will have to learn the new words.

Model 2: He can skate well.

He could skate well.

He will be able to skate well.

Model 3: You may smoke in the corridor.

You were allowed to smoke in the corridor.

You will be allowed to smoke in the corridor.

1. The reinforced concrete continuous footing can have greater width and smaller height than the mass concrete footing.

2. They must be highly mechanized.

3. A building must be made of the reinforced concrete units.

4. Prefabricated units may be classified into two main groups: for residential and industrial buildings.

5. The house can be assembled of precast concrete elements.

6. Present–day designs for housing must give greater attention to the size of dwellings.

Translate the following sentences into Russian paying attention to the modal verbs.

1. These techniques are to increase the output of better structures at lower cost.

2. The buildings erected at present can be divided into two general classes: buildings for housing and industrial buildings.

3. Floors may be either of timber or of reinforced material.

4. The walls may be solid and hollow.

5. The materials used for construction of footings can be brick, stone, concrete and other natural or artificial materials.

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