The examples of passive tense, subject, verb and object :

Examples of Passive 

Tense		Subject	Verb	Object
Simple Present	Active:	Suzie	writes	a letter.
	Passive:	A letter	is written	by Suzie.
Simple Past	Active:	Suzie	wrote	a letter.
	Passive:	A letter	was written	by Suzie.
Present Perfect	Active:	Suzie	has written	a letter.
	Passive:	A letter	has been written	by Suzie.
Future I	Active:	Suzie	will write	a letter.
	Passive:	A letter	will be written	by Suzie.
Hilfsverben	Active:	Suzie	can write	a letter.
	Passive:	A letter	can be written	by Suzie.

Examples of Passive 

Tense		Subject	Verb	Object
Present Progressive	Active:	Rita	is writing	a letter.
	Passive:	A letter	is being written	by Suzie.
Past Progressive	Active:	Suzie	was writing	a letter.
	Passive:	A letter	was being written	by Suzie.
Past Perfect	Active:	Suzie	had written	a letter.
	Passive:	A letter	had been written	by Suzie.
Future II	Active:	Suzie	will have written	a letter.
	Passive:	A letter	will have been written	by Suzie.
Conditional I	Active:	Suzie	would write	a letter.
	Passive:	A letter	would be written	by Suzie.
Conditional II	Active:	Suzie	would have written	a letter.
	Passive:	A letter	would have been written	by Suzie.

Passive Sentences with Two Objects 

Rewriting an active sentence with two objects in passive voice means that one of the two objects becomes the subject, the other one remains an object. Which object to transform into a subject depends on what you want to put the focus on.

	Subject	Verb	Object 1	Object 2
Active:	Suzie	wrote	a letter	to me.
Passive:	A letter	was written	to me	by Suzie.
Passive:	I	was written	a letter	by Suzie.

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