Shall, will

a. Mechanical energy furnished by a water wheel or an engine  
  II  
  is converted by a generator into electrical energy.  
b. Because of its numerous advantages the electric motor  
  II    
  has largely replaced other motive power.  
    II    
c. This inert core does not contribute directly to the properties  
  of the element, both electrical and chemical.  
d. When the temperature of the vessel decreases, some of the steam
  II   II    
  will be condensed and will give up the latent heat.  
                               

б) модальным глаголам:

can (could); may (might); must (to be (to); to have (to); should, ought

  II  
a. Chemical energy can be converted into electrical energy
  directly without going through heat.
  II    
b. To do so we must make use of an electric cell.  
             

в) наречиям неопределенного времени, которые сопутствуют сказуемому:

always, already, often, seldom, sometimes, usually, generally, commonly, never, ever…

  II  
Thus, the current in a conductor always produces  
  magnetic field surrounding or linking with the conductor.
       

г) подлежащему, выраженному личным местоимением в именительном падеже:


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