1 Look at the sentences in the table and complete
the rules with the words in the box.
bought -ed has have
a) We form the present perfect using (1) ... or
(2) ... with the past participle of the verb.
b) We form the past participle of regular verbs by
adding (3) ... to the verb.
c) In the examples, (4)... is an irregular past
participle.
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