Past tense of show

The past simple tense form is (verb) + ed, 'showed'

Example:

"Yesterday my mother showed me all her wedding pictures, but I wasn't in any of them!"

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The past participle of show is 'shown'

The 'past participle' of a verb is used for the perfect tense, the passive tense, or as an adjective. It's use is not restricted to 'past' tense forms.

Some examples:

Passive

- The visitors are being shown the stables by the tour guide. (present progressive passive)

- They have already been shown the gardens. (present perfect passive)

- After they had been shown the gardens, they all had coffee on the lawn. (past perfect passive)

- They will be shown our precious art collection after lunch." (future passive)

Perfect

- The courts have shown much clemency. (present perfect)

- The student had shown great potential. (past perfect)

- If this team wins their next match against the present champions, they will have shown their superiority. (future perfect)

Adjective

- The museum has a huge collection of masterpieces. The rarely shown paintings are kept in safe storage, and can be seen only by special appointment.