, . , : 1) ( ); 2) ( ); 3) (, , ); 4) ( , , ). .
, .. , , . : . : It is cold. , , : , : . The material has been delivered The material was delivered.
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: to be (am, is, are; was, were; shall be, will be), to have (have, has; had; shall have, will have), : can, could; may, might; must; should, to be to, to have to, ought to), -s, -es; -ed. , . :
This results in an excellent effect. , results . : .
, , , , , , , , , , , , , . : During the last few years the general experimental procedures for measuring reaction rates in homogeneous (gases and fluid) systems have been repeatedly described in various outstanding monographs. ( ) . , . , , . , , , .. . :
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The classical Fourier heat conduction law was used. .
Propagation speeds of four types of thermo-elastic waves were considered. .
, - : one, they, it. :
. When translating English texts one is often faced with different difficulties.
. It is cold in the laboratory.
. It is difficult to imagine modern life without reinforced concrete.
, . It is common knowledge that all building materials are divided into different groups.
, . They say that the cost of fire damage is increasing.
, , (any), . :
A concrete plate was delivered to the site. .
New data were obtained in our laboratory. .
, , , .. . :
The concrete plate was delivered to the site. .
These new data were obtained in our laboratory. .
, there is, there are, , . :
There are many unsolved problem in road building. .
There is a formal analogy between these two integrals. .
, there is/are, , , . :
There are two types of cement: natural and artificial. : .
- . , , . :
Study this material properly. .
