When do I use ''shown'' and ''showed'' ?
ex:
Was I not shown in the video?
We're shown for the same amount of time.

is this correct? why not ''showed''?

Question

When do I use ''shown'' and ''showed'' ?
ex:
Was I not shown in the video?
We're shown for the same amount of time.

is this correct? why not ''showed''?

Answer

shown is far more common.
"Showed" is past tense, as in "I showed the book to a friend." "Shown", is past perfect tense,  
it is  opinion

Answer

Sayed is correct.
Examples:

I showed my mom my test.
I had shown my test to my mom

It's based on timing.

Answer

In passive, you use past participle. Showed is past tense and shown is past participle.

Answer

This verb can be used as both irregular and regular verb.Shown is the verb3 form of irregular verb.Showed is used either.This sentence is in Passive Voice.
I was not shown in the video.