As you learn in the Passive Voice grammar structure, you need the past
participle to form the sentences. The past participle is the regular or
irregular verbs when you have regular verbs to form it you need to add -ed at
the end of root verb and if you have an irregular verb you use the correct past
participle.
You need to learn and memorize which verbs are irregular and which are
regular, so in the next link you will find the list of irregular verbs: Irregular Verbs List
For the other side, there is the regular that is easier to form because
you just have to add –ed to the verb. But, there are some rules to spell these
verbs:
- Add –d when the base form ends with –e.
- Change y to i and –ed when the base ends in consonant and y.
- Double the final consonant and add –ed when the base form of one syllable ends with a single vowel.
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