Should I put commas in sentences like this?

The price of software is defined(,) based on...

The amount is calculated(,) based on...

computers(,) developed by...

approvals for advertising and marketing activities(,) related to...

If it's a complicated question, what should I read to understand the rules?

  • 3
    The presence of commas has nothing to do with the voice of the verb in the main clause, but with whether the modifier is restrictive.
    – deadrat
    May 28, 2016 at 9:14

1 Answer 1


Having a passive voice has nothing to do here. I believe you need to study how the adjective phrases are omitted and reduced.

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