You need to study the past participles and know them really well in order to build different tenses, such as the present or past perfect and the passive tenses, so here are some exercises:
My favourite way of learning the English irregular verbs is by making different groups according to the different forms, read this interesting grammar explanation.
Exercise 1
Exercise 2
PAST PARTICIPLES FOR LEVEL 1
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THERE IS OR IT IS, THERE WAS OR IT WAS???????? DIFFERENCE BETWEEN THERE AND IT/THEY
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