Subject and verb

Verb 'to be' and past participle

Object and preposition

Preposition 'by' and subject

'Bought by'

'Buying'

'To buy'

'Is bought'

Passive voice

Active voice

Both are equally direct

Depends on the context

To sound less formal

To avoid using verbs

To make the sentence longer

To highlight the action rather than the doer

It is grammatically incorrect

It is less direct

It can make sentences unclear

It is always awkward

'Vandalized'

'Will be vandalized'

'Is vandalized'

'Got vandalized'

News reporting

Academic prose

Fictional narrative

Personal letters

It's too informal

It's too direct

It makes the writing less objective

It's grammatically incorrect

'It was seen'

'It has been done'

'It is known'

'It will be argued'

Always use passive voice

Always use active voice

Be aware of which voice you're using

Mixing voices is incorrect