: both
bothand
either
eitheror
1. Natural gas either occurs together with crude oil or forms separate deposits of gas alone. 2. Either of these properties can be used in this analysis. 3. Natural gas may be used either as fuel or heat in our everyday life. 4. Most of natural gas we may use as a fuel for the production of both heat and energy. 5. Decomposition of both animal and vegetable remains over a period of many centuries without air is the source of natural gas. 6. Both the pressure and volume of a gas can be changed.
7. Both characteristics of the state of a gas are very important for the experiments.
8. Homogeneous materials may be classified either into compounds and elements or into solutions. 9. Natural gas either occurs together with oil or forms separate deposits of gas alone. 10. The density of gases is measured either with special gas pycnometers or by the effusion method. 11. The state of a gas is characterized both by pressure-temperature and volume. 12. A field may be either a single pool or it may consist of two or more pools, all of, or related to, the same geologic structure.
13. Both oil and gas are naturally occurring mixtures of mainly hydrogen and carbon compounds. 14. Oil may be displaced from sand by either water or gas. 15. Oil and gas are used both as the fuel and chemicals. 16. Generally oil seeps are either up-dips or seepage along a fracture.
. like (like - , ; , ).
1. Like all gaseous fuels natural gas has great advantages over liquid and solid fuels. 2. The engineer whom we met at the laboratory has three sons. His elder son is taking a course at the Petroleum University. Like his father he is going to become a petroleum engineer. He looks like his father. He likes his future speciality. 3. The level of petroleum education like that of all other types of education has grown manyfold.
, - one. , one .
1. The training of petroleum engineers and geologists includes a comprehensive study of general subjects as well as specialized ones. 2. One can see modern computers at every laboratory. 3. A new method of oil production is more effective than the one we used some years ago. 4. Russia has always been one of the predominant oil and gas producing countries. 5. Liquids or gases are injected into the common reservoir through one or more injection wells. 6. Oil may be displaced from sand by any one, or a combination of three mechanisms. 7. The earth`s crust is the zone on which we live and the one accessible for our investigation. 8. One of the earliest patents for an offshore drilling rig was issued to T.F. Rowland in 1869. 9. Man, for one reason or another, has since the earliest known times been digging holes in the earth`s surface.
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13. , : little, a little, few, a few.
1. There are things here which I cannot understand. 2. Have you got ink in your fountain-pen? 3. When we walked farther down the road we met another group of students. 4. If you have spare time, go through this book. You will find articles there which are rather interesting. 5. Has Russia much ornatural gas?
14. :
| can could | am able to is able to are able to | Was able to were able to | shall be able to will be able to |
| may might | am allowed to is allowed to are allowed to | Was allowed to were allowed to | shall be allowed to will be allowed to |
| Must should , | have to has to (, ) am to is to are to ( , ) | Had to was to were to | shall have to will have to |
