The present participle is formed by adding -ing to the base form of a verb. It is used in:
i) Continuous or Progressive verb forms - I'm leaving in five minutes.
ii) As an adjective: A dying man
The past participle is formed by adding -ed to the base form, unless it is an irregular verb. It is used:
i) As an adjective - A tired group
iii) with the verb 'be' to form the passive - He was robbed a couple of days ago.
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