been, be / was were, gone, go / went, broken, break/ broke, brought, bring/ brought, built, build / built, bought, buy / bought , caught, catch / caught, chosen, choose / chose, come, come/ came , drunk, drink / drank, eaten, eat / ate, done, do / did, driven, drive / drove, fallen, fall / fell, fed, feed / fed, found, find / found , flown, fly / flew, given, give / gave, spoken, speak / spoke, taken, take/took, thought, think /thought, sung, sing/ sang, swum, swim / swam, written, write/ wrote, worn, wear/ wore, known, know / knew, drawn, draw / drew, lost, lose / lost, seen, see / saw, left, leave / left.

present perfect forms

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