"To be" and its functions. "To have" and its functions

II. Make the sentences interrogative and give short answers:

1. 
   We have applied a human process to machines to make them robots.
   
2. 
   After the telemeter has sorted out the messages, it sends them to a number of recording devices.
   
3. 
   Scientists have developed different types of lasers.
   
4. 
   Automation has been particularly successful at hydropower stations.
   

III. State the tense forms and translate the following sentences:

1. 
   They had completed all the operations on electrical quantities by that time.
   
2. 
   This unit will have converted the information into pulse form before that procedure.
   
3. 
   The instrument partly lost its former efficiency after we had used it for a long time.
   
4. 
   We learned that Maxwell’s equation had led to Hertz discovering radio waves which, in turn, had resulted in Popov’s invention of wireless telegraphy and developments in radio engineering.
   
5. 
   They will have covered all parts of mechanism with a thick coat of paint before the start of the experiment.
   

IV. Translate the following sentences paying attention to the Passive Voice:

1. 
   During the past few years, a machine of this type has been developed.
   
2. 
   Silicon has been prepared successfully in rather pure, single – crystalline form.
   
3. 
   The analog computer performs mathematical operations on electric quantities which have been converted from the physical variables of the problems.
   
4. 
   Simple counting devices have been known since ancient times.
   
5. 
   The various systems have been brought to such a state of perfection that almost any fault can be traced in a very few minutes.
   
6. 
   By that time electronic means had been devised to keep the tension of the moving material at exactly right value.
   
7. 
   New equipment of air-conditioning will have been employed to maintain interiors at a comfortable temperature, summer and winter, and free from draughts.