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 the subject of the active sentence becomes the object of the passive sentence
(or is dropped)

Examples of Passive
Tense Subject Verb Object
Simple Active Drilling crew drills the hole.
present Passive The hole is drilled by drilling crew.
Simple Active Drilling crew drilled the hole.
past Passive The hole was drilled by drilling crew.
Present Active Drilling crew has drilled the hole.
perfect Passive The hole has been drilled by drilling crew.
Future I Active Drilling crew will drill the hole.
Passive The hole will be drilled by drilling crew.
Modal Active Drilling crew can drill the hole.
verbs Passive The hole can be drilled by drilling crew.

Examples of Passive
Tense Subject Verb Object
Present Active Drilling crew is drilling the hole.
Progressive Passive The hole is being drilled by drilling
crew.
Past Active Drilling crew was drilling the hole.
Progressive Passive The hole was being drilled by drilling
crew.
Past Perfect Active Drilling crew had drilled the hole.
Passive The hole had been drilled by drilling
crew.
Future II Active Drilling crew will have drilled the hole.
Passive The hole will have been drilled by drilling
crew.

Conditional I Active Drilling crew would drill the hole.
Passive The hole would be drilled by drilling
crew.
Conditional II Active Drilling crew would have drilled the hole.
Passive The hole would have been written by drilling
crew.

Personal and Impersonal Passive

Personal Passive simply means that the object of the active sentence becomes the
subject of the passive sentence. So every verb that needs an object (transitive verb)
can form a personal passive.
Example: They perforated holes. – Holes are perforated.

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