Please note: In AmE English, there is increasing use of:
- The vending machine was broke. [instead of broken]
- The man was bit by the dog. [instead of bitten]
- The girl was took off the field by the coach. [instead of taken]
Now, how do you want to sound?
The standard grammar here is broken, bitten and taken off the field. This is the usage for passive sentences.
The standard form uses the past participle here. For irregular verbs, that would be the "third form", as in bite, bit,bitten or take, took, taken for verbs with three forms. Of course,some only have two forms: find, found, found.
- He was found by the people looking for him.
If you do not use the standard form (by the way, people speak how they speak), your speech will be marked as (depending on whom is judging you): uneducated or regional or dialectal.
If you were being interviewed for a fancy job, how you speak can make a big difference. If you come from a region where people often speak like that (for example, Texas or Alabama), you would still be expected to code switch and use standard English.
"He was bit by the dog." is often considered the same type of speech as: "He don't do his work right". That would be using don't instead of doesn't in the third person singular of the present tense.
So, to answer the question: It all depends on how you want to sound.