13.Употребитеглаголы, данныевскобках, в Present, Pastили Future indefinite (Simple) Tenses. Предложенияпереведите.

1. My brother (to sing) in Italian opera. 2. Why people (to do) stupid things? 3. I (to be) thirsty yesterday, so I (to buy) a bottle of juice. 4. If the patient (to con­tinue) to improve, we (to transfer) him to another ward. 5. If she (to buy) the tickets, she (to let) you know about it. 6. Before you (to leave), sir, 1 (to give)you your pre­sent back. 7. Charlie Chaplin (to die) in 1978.He (to be) a famous film star. 8. How she usually (to get) to the institute? - She (to get) there by bus. 9. Tom (not to shave) yesterday because he (not to have) time. 10. If I (to need) any help, I (to ask) you.

14. Прочтите и письменно переведите текст по специальности.

Building Materials

1. Sand.Sands may be considered as consisting of two parts, namely: a)sand proper; b) fines. The fines themselves may be subdivided into material finer, than the sand but of the same chemical, composition, termed silt and material still finer than silt and of different chemical composition, termed clay.

2. Cement.There two groups of cement, natural and artificial. Natural cement is made of nodules consisting of lime (30% (per cent)), clay (50%) and oxides of iron (10%); these lumps are burnt and then ground into powder, which is of a brown color due to the iron content. The artificial cement, group includes several types to be found in reference books.

3. Mortars. Mortar is the matrix used in the beds and side joints of brickwork and for plastering walls and floors. Its functions are follows: 1) to distribute the pressure throughout the brickwork; 2) to adhere and bind the bricks together; 3) to act as a non-conductor and prevent the transmission of heat, sound and moisture from one side of the wall to the other. Mortar consists of an inert aggregate bound by a cementing material. The cementing material is most important in determining the characteristics of the mortar. The usual cementing materials used for constructional work are hydraulic limes of Portland cement. Clean, sharp pit sand is the best aggregate. Old bricks or stones ground is a mortar mill may be used as substitutes for sand.

4. Stone. Sedimentary rock – this division comprises those stones, which are chiefly employed for building purposes. Most of these rocks are formed of fragments of igneous rocks, which have been deposited by water in layers or strata. As successive layers were formed these sediments became hardened and consolidated under great pressure and were cemented together by sandy or clayey paste or by the percolating water. Other rocks of this division are formed from remains of marine organisms (shellfish, etc.) andchemically by precipitation. The principal sedimentary rocks are sandstones and limestone. Sandstones – these consist of grains and quarts (sand or silica) held together by a cementing material.

15. Выпишите из текста 10 терминов и переведите их на русский язык.