inglese - forma passiva

inglese - forma passiva

la forma passiva è usata quando conviene  sottolineare la cosa fatta piuttosto che chi la fa  o quando non si sa chi la fatta

Tutte e due le condizioni  succedono spesso quando si parla di dati tecnici

ecco degli esempi

active form                                                         passive form

they built up stranded conductor on                   stranded conductor are built up on a single central
a single central conductor                                  conductor

we use copper and aluminium for                    copper and aluminium are used for overhead lines
overhead lines  

by this method the operator achieves a             a great saving in time is achieved by this method
great saving in time

they are repairing the motor                               the motor is being repaired



Nel caso in cui il complemento di agente è menzionato è sempre preceduto da by
ci sono delle eccezioni in cui può essere preceduto da in  o with

a central steel core often strengthens             conductor for overhead lines are often strengthened
conductors for overhead lines                        by/with  a central steel core

a single sheath may enclose more than          more than one core may be enclosed in a single sheath
one core

standard colours identify cable and wire       cables and wire are identified by / with standard colours



in teoria  una frase attiva con oggetto diretto e indiretto  potrebbe avere due diverse forme

someone showed him the house                        the house was shown  to him
                                                                           he was shown the house


in pratica solo la seconda frase passiva è quella più corretta

ecco come si presentano le frasi con verbi che richiedono una preposizione come depend on - refer to
etc.

They awarded (assegnare ) a quality prize to the firm                  the firm was awarded a quality prize

someone  taught him how to start the engine                   he was taught how to start the engine

we give special heat treatments to nickel-iron alloys             nichel-iron alloys are given special heat
                                                                                             treatments

we can rely upon resistance tests to give                       resistance tests can be relied upon to give
fairly accurate results                                                       fairly accurate results

we usually refer to rounds of 5/8 inch diameter             rounds of 5/8 inch diameter and less are
and less as rods                                                               usually referred to  as rods

they find large application for coaxial cables in          coaxial cables are found large application in
radar transmission lines                                               radar transmission lines